Republican lawmakers are surprised and disappointed by the results of Super Tuesday, which firmly re-established former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE as the front-runner for the Democratic presidential nomination and dealt Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon 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 Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) a major setback.

Republican senators conceded Wednesday they would rather face Sanders, a self-described democratic socialist, as the opposing nominee, instead of Biden, whom they consider more mainstream and tougher to draw a contrast with.

In the battle for the Senate, Republicans would like to tie Democratic candidates to Sanders and socialism, and generally see Biden as a stronger candidate. Similarly, Democrats were uneasy about Sanders as their standard-bearer, and Biden has made this a point of attack on the campaign trail, arguing he would help Democrats take back the Senate.

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“I think Bernie is the easiest to contrast with. Biden would be a little harder to contrast with,” said Sen. Lindsey Graham Lindsey Olin GrahamSenate Republicans signal openness to working with Biden Loeffler calls for hearing in wake of Netflix's 'Cuties' Quinnipiac poll shows Graham, Harrison tied in South Carolina Senate race MORE (R-S.C.). “Truly, I think it’s better for us for Bernie to be the nominee in terms of down-ballot.”

The day after Biden’s big wins, Democrats received the welcome news that Montana Gov. Steve Bullock Steve BullockSenate Democrats demand White House fire controversial head of public lands agency Pence seeks to boost Daines in critical Montana Senate race Trump's fear and loathing of voting by mail in the age of COVID MORE is poised to enter the race against Sen. Steve Daines Steven (Steve) David DainesSenate Democrats demand White House fire controversial head of public lands agency Pence seeks to boost Daines in critical Montana Senate race The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support MORE (R-Mont.). Bullock would be a huge recruit for Senate Minority Leader Charles Schumer Chuck SchumerDemocrats scramble on COVID-19 relief amid division, Trump surprise Pelosi, Schumer 'encouraged' by Trump call for bigger coronavirus relief package Schumer, Sanders call for Senate panel to address election security MORE (D-N.Y.).

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellSenate Republicans signal openness to working with Biden Hillicon 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 The 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 MORE (R-Ky.) said last year he wanted to make the 2020 election a “referendum on socialism,” a plan that would be helped immensely if Democrats nominate Sanders, who advocates for “Medicare for All,” free college, student debt forgiveness and a wealth tax.

With Biden re-emerging as the favorite to win the Democratic nomination, GOP lawmakers acknowledge 2020 is likely to be more of a referendum on President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE.

Sen. Rand Paul Randal (Rand) Howard PaulGOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill Overnight Health Care: Senate Democrats block GOP relief bill | Democrats reveal Medicaid chief's spending on high-paid consultants | Trump calls question about why he 'lied' about COVID-19 a 'disgrace' MORE (R-Ky.) called Biden the “safe pick” for Democrats. He said Sanders was “an easier target because he admits his socialism.”

Other Democratic candidates “believe in most of the things he believes in, but they don’t call themselves socialists,” he added.

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GOP lawmakers thought they even had a chance of winning the House with Sanders as the Democratic nominee. Now that hope is fast fading, according to a GOP senator who requested anonymity to assess the presidential race.

“Anybody who wants the president to have an easier time with reelection, I think Sanders clearly helps that outcome,” said the Republican senator.

He said the speculation among Republicans on Capitol Hill on Wednesday morning was “if it’s not Sanders, Republicans probably don’t get the House back.”

“If it is Biden, that makes it a different outcome in the House,” the lawmaker added. “I don’t think the country is at all close to where Sanders is.”

It’s possible the GOP conventional wisdom, which is shared by much of the Democratic establishment, is wrong and Sanders would be a stronger candidate in the general election than Biden. Democrats in 2016, after all, thought Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The 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 MORE would defeat Trump.

Republicans also said that the primary fight between Sanders and Biden could leave the Democrats scarred. Several predicted the primary will drag on into the July convention.

“It doesn’t mean the Sanders folks all fall into line. They didn’t last time. He’s pretty out there,” one senator added.

Republican senators think a protracted fight for the nomination will force Biden to tack further to the left than he might otherwise think optimal for the general election.

Senate Republican Whip John Thune John Randolph ThunePowell warns failure to reach COVID-19 deal could 'scar and damage' economy Senate Republicans signal openness to working with Biden Democrats scramble on COVID-19 relief amid division, Trump surprise MORE (S.D.) said that GOP leaders will still try to slap the socialism label on Biden.

“There’s a lot of their primary process ahead and I think it’s probably going to be very contested and very contentious, I suspect, between Biden and Bernie,” he said. “All of the candidates have been pushed in the same direction. I think that they’ve been pushed pretty much to the far left.”

“To ultimately win the nomination, you’re going to have to take some very far-left positions,” he added.

But Democratic candidates in Senate battleground states are breathing a sigh of relief after Biden’s strong Super Tuesday showing.

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Sara Gideon, the Democratic Speaker of the Maine statehouse, revealed Wednesday that she voted for Biden after previously declining to take a position in the presidential race.

Her opponent, Sen. Susan Collins Susan Margaret CollinsThe 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 Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (R-Maine), by contrast, has declined to say whether she’ll support Trump’s reelection.

Gideon praised Biden as the candidate “most able to bring the country together and to look into the future to address all the changes we face.”

Even with Biden back in the spotlight for the Democratic nomination, Republican lawmakers say they still feel good about the upcoming election.

Graham said, “I just believe this is Trump’s election to lose if the economy hangs in there.”

“If you’re a Democrat, you got to be worried about a brokered convention now because I don’t think Bernie’s going to go away. You’re not going to have a clear winner, I think,” he said.

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Paul said Biden, despite his recent string of victories, has revealed himself to be an unsteady public speaker and weak debater.

Biden at a Monday rally in Dallas struggled to remember the opening of the Declaration of Independence and almost urged his voters to turn out on “Super Thursday” before quickly correcting himself.

“Have you ever seen a national candidate or nominee stumble over so many words and putting sentences together? I think he’s really struggling. I think Trump will make mincemeat of him in a debate,” Paul said.