Nearly all House Democrats are taking the plunge and planning to vote for the articles of impeachment against President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE on Wednesday.

As of Tuesday afternoon, all but four of the 31 Democrats representing districts Trump won in 2016 had announced that they will support both articles of impeachment accusing the president of abuse of power and obstruction of Congress.

Just two Democrats have indicated that they will oppose the articles, setting up what’s expected to be a highly partisan affair with few members on either side of the aisle breaking party lines.

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A third Democrat, Jared Golden (Maine), said Tuesday that he would vote for only one article — abuse of power — but would oppose charging the president with obstruction of Congress. The fourth has yet to publicly declare how he will vote.

The majority of Democrats in tough districts tried to keep impeachment at arm’s length for most of this year. But following the whistleblower complaint and House investigation into Trump’s attempts to pressure the Ukrainian government to investigate his political opponents while withholding military aid, those Democrats now say that it’s time.

“To be honest with you, if this was a political calculation, then I wouldn't have come out for an inquiry and I wouldn't be voting yes on articles,” said freshman Rep. Elissa Slotkin Elissa SlotkinWray: Racially motivated violent extremism makes up most of FBI's domestic terrorism cases Overnight Defense: House chair announces contempt proceeding against Pompeo | Top general says military has no role in election disputes | Appeal court rejects due process rights for Gitmo detainees Top general: Military will play no role in resolving any electoral dispute MORE (D-Mich.), who represents a district that Trump won by nearly 7 points. “It's the biggest honor of my life to represent this district, but I'm not going to compromise my integrity to do it.”

Only one Democrat representing a district that went for Trump has yet to say how he would vote: Rep. Ron Kind Ronald (Ron) James KindWisconsin Rep. Ron Kind wins primary Democrats exit briefing saying they fear elections under foreign threat Bottom line MORE (Wis.), who declined to state his position on Tuesday and told reporters in the Capitol to “tune in tomorrow.”

But he did not sound sympathetic toward Trump, saying that “it certainly looks like the president's in big trouble here in the House.”

Democratic Reps. Collin Peterson Collin Clark PetersonKate Schroder in Ohio among Democratic challengers squelching GOP hopes for the House The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida Peterson faces fight of his career in deep-red Minnesota district MORE (Minn.) and Jefferson Van Drew (N.J.) have indicated they will break party lines and oppose both articles of impeachment.

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But Van Drew is signaling plans to switch parties, though it is unclear if he will officially become a Republican before voting on the articles of impeachment.

“Impeachment is going to fracture the country even more,” Van Drew told reporters Tuesday. “Impeachment is going to make people even angrier and angrier at each other, and we're going to have an election in 10 or 11 months.”

Several Democrats in crossover districts on Tuesday joined the ranks of their cohorts who had already announced their plans to back the impeachment articles. They included Reps. Mikie Sherrill Rebecca (Mikie) Michelle SherrillHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll House passes legislation to boost election security research Lawmakers call for bipartisan push to support scientific research MORE (N.J.), Lauren Underwood Lauren UnderwoodHillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Underwood takes over as chair of House cybersecurity panel Obama announces first wave of 2020 endorsements MORE (Ill.), Cheri Bustos Cheryl (Cheri) Lea BustosThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally DCCC dropping million on voter education program Clark rolls out endorsements in assistant Speaker race MORE (Ill.), Abby Finkenauer Abby Lea FinkenauerCentrist Democrats got their COVID bill, now they want a vote Trump asked Chamber of Commerce to reconsider Democratic endorsements: report House Democrats' campaign arm reserves .6M in ads in competitive districts MORE (Iowa), Cindy Axne Cindy AxneCentrist Democrats got their COVID bill, now they want a vote Vulnerable Democrats tell Pelosi COVID-19 compromise 'essential' House passes bill to avert shutdown MORE (Iowa), David Loebsack (Iowa), Haley Stevens Haley Maria StevensUS Chamber of Commerce set to endorse 23 House freshman Democrats Eric Esshaki wins Michigan GOP primary to challenge Haley Stevens The Hill's Campaign Report: Buzz builds around Warren for VP MORE (Mich.), Kendra Horn Kendra Suzanne HornKate Schroder in Ohio among Democratic challengers squelching GOP hopes for the House GOP women's group rolls out six-figure campaign for Ernst Trump asked Chamber of Commerce to reconsider Democratic endorsements: report MORE (Okla.) and Anthony Brindisi (N.Y.).

Swing-district Democrats said there was no coordination among their freshman colleagues to come out in favor of impeachment. They each assessed the evidence against Trump and arrived at the same decision individually, said freshman Rep. Dean Phillips Dean PhillipsCentrist Democrats got their COVID bill, now they want a vote Vulnerable Democrats tell Pelosi COVID-19 compromise 'essential' Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (D-Minn.).

“I think there might be a sense that somehow we all talked with each other and we all decided to jump together. But the truth is we came to our conclusions independently and for the same reason,” Phillips, who unseated a GOP incumbent in a district carried by Hillary Clinton Hillary Diane Rodham ClintonThe Memo: Trump furor stokes fears of unrest Bloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close MORE, told The Hill.

“A lot of us ran for Congress because we wanted to bring principles to a place that so favors self-preservation,” Phillips added. “And that's why I'm really proud of my colleagues because many of them, myself included, could lose our jobs over this. And if we do, so be it. That's the consensus of my colleagues.”

House Majority Leader Steny Hoyer Steny Hamilton HoyerCentrist Democrats got their COVID bill, now they want a vote House to vote on resolution affirming peaceful transition of power On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline MORE (D-Md.) reiterated that impeachment will be a vote of conscience for his members and that no one in leadership is pressuring them to vote one way or the other.

“I have not asked a single member, nor has [Speaker Nancy] Pelosi [D-Calif.] asked a single member, to vote for or against,” Hoyer told reporters. “I think the greatest protection these members will have — all members will have — is that they vote their conviction and the Constitution, not their politics.”

Horn and Brindisi, who represent districts deep in Trump country, were considered among the most likely to break party lines.

But ultimately the two fell in line as the number of vulnerable Democrats backing impeachment swelled in recent days.

Horn defeated a GOP incumbent last year by just 1 point in a district Trump carried by 13 points.

She said in a statement that "the oath I took to protect and defend the Constitution requires a vote for impeachment."

Brindisi, whose district went for Trump by 15 points, acknowledged in an interview with The Post-Standard that “I know some people will be upset with me.”

“President Trump is my president, too,” Brindisi said. “I always said I would work with him, but that I would put our country first and stand up for what I believe in.”

Also among the Democrats to hold out on announcing a position on impeachment until the day before the vote was Bustos, who chairs the Democratic Congressional Campaign Committee and leads party campaign strategy.

Bustos easily won reelection in recent election cycles but represents a district that Trump carried by less than a point.

“With both a profound sense of constitutional duty and deep respect for the Office of the Presidency, I will solemnly cast my vote in favor of both articles of impeachment for Senate consideration,” Bustos said in a statement.

Republicans, on the other hand, are not expecting any defections.

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Only three House Republicans represent crossover districts that Clinton carried, and all are expected to hold the party line.

One of those Republicans, Rep. Brian Fitzpatrick Brian K. FitzpatrickHopes for DC, Puerto Rico statehood rise Florida Democrat introduces bill to recognize Puerto Rico statehood referendum DCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program MORE (Pa.), acknowledged on Tuesday that he thought Trump’s July call with the Ukrainian president pressing for the investigations “showed poor judgement” and that “law enforcement matters must always remain separate and distinct from political matters.”

Yet Fitzpatrick went on to argue in a statement that he believed the impeachment inquiry had been “rushed” and “partisan,” therefore falling short of his standards for support.

Rep. Katherine Clark Katherine Marlea ClarkDemocratic leaders: Supreme Court fight is about ObamaCare Rep. Robin Kelly enters race for Democratic caucus vice chair Clark rolls out endorsements in assistant Speaker race MORE (D-Mass.), the Democratic caucus vice chairwoman, acknowledged that the party is taking a big risk with impeachment.

“We don't know how this may or may not affect the 2020 elections,” Clark told reporters in the Capitol.

“But we know this: We have this opportunity in the history of our country to stand up, defend our Constitution and send a clear message not only to this president but to every president in the future that we are a coequal branch of government that is going to insist that no one is above the law.”

Mike Lillis contributed.