Today marks the unofficial start of the 2020 presidential primary season.

Prospective Democratic candidates hoping to launch a White House bid will be out in full force campaigning for midterm candidates this weekend and into the homestretch these next 30 days.

The would-be candidates — including former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE and Sens. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (Calif.) Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (N.J) and Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (Mass.) — will be crisscrossing the country to help candidates in tight races as Democrats aim to win back the House and Senate. ADVERTISEMENT

The midterm campaigns are a tryout of sorts for 2020, strategists say.

“Campaigning vigorously in the midterms for candidates means you can test your appeal to enthusiastic voters in states and districts that may be hard to get to during the course of a presidential race,” said Democratic strategist Basil Smikle. “You also hope that the candidates you’re supporting — win or lose — may repay the favor.”

“It also helps expand fundraising terrain,” he added.

Democratic strategist Eric Jotkoff said the networking is equally as important.

“Every hand you shake is a potential volunteer for a 2020 run,” Jotkoff said. “Every person you talk to is a potential grass-roots donor. Every candidate you help is a potential endorser. And every press clip you get while campaigning for others helps boost your name ID.”

This weekend, Booker — who garnered headlines with his staunch opposition to Supreme Court nominee Brett Kavanaugh — will be in Des Moines, Iowa, which holds the first Democratic caucus in January 2020. The New Jersey Democrat will headline the party’s annual fall gala — formerly known as the Jefferson-Jackson Dinner — on Saturday night.

“He’s coming off a time when he got lots of exposure, and this event should be good for him,” said one Democratic strategist who has worked on presidential campaigns. “It adds some momentum.”

In an interview with the Des Moines Register, Booker said he intentionally hasn’t gone to Iowa because of the speculation on whether he would run for president.

“I think it’s irresponsible for anybody really to be focusing needed energy on an election two years and two months from now, as opposed to an election just two months from now,” Booker told the Register in early September. “Let’s put it this way: The pathway to getting a check and balance to the president of the United States, it has to go through Iowa. And that’s why I have to go through Iowa."

Harris — who has also been front and center on the Kavanaugh hearings and is often mentioned as a potential front-runner in the 2020 race — will be in Ohio this weekend to campaign for Democrats like Richard Cordray Richard Adams CordrayConsumer bureau revokes payday lending restrictions Supreme Court ruling could unleash new legal challenges to consumer bureau Supreme Court rules consumer bureau director can be fired at will MORE and Betty Sutton, who are running for governor and lieutenant governor, respectively, and Sen. Sherrod Brown Sherrod Campbell BrownHarris faces pivotal moment with Supreme Court battle Remote work poses state tax challenges Senate Democrats release report alleging Trump admin undermined fair housing policies MORE.

Harris’s office has already telegraphed that she’s in demand, announcing that the California senator will travel to Arizona to campaign for Rep. Kyrsten Sinema’s (D) Senate bid and for other races in the state. She’ll travel to Wisconsin the following weekend to stump for Sen. Tammy Baldwin Tammy Suzanne BaldwinSenators introduce bipartisan bill to mandate digital apps disclose country of origin Keep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser MORE’s reelection campaign.

“Her star is definitely on the rise, and that’s reflected in this schedule,” the Democratic strategist said.

Other would-be candidates are also hitting the road. Deval Patrick, the former Massachusetts governor, will be in New Jersey to stump for Josh Welle, who is challenging 19-term Rep. Chris Smith Christopher (Chris) Henry SmithChina sanctioning Rubio, Cruz in retaliatory move over Hong Kong China sanctions Cruz, Rubio, others over Xinjiang legislation New Jersey incumbents steamroll progressive challengers in primaries MORE (R).

Rep. John Delaney John DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE (D-Md.) — who has already announced his candidacy for president and has spent considerable time in Iowa — will appear at campaign events in Texas.

Former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE will be in Georgia on Sunday for Stacey Abrams’s gubernatorial run before traveling to North Carolina for a two-day visit starting on Monday.

Other prospective candidates will dive into midterm action next week: Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) will be in Georgia on Monday to campaign for Abrams and other candidates across the state.

Warren will also be in Georgia for a string of events for Abrams on Tuesday.

Biden, meanwhile, begins his midterm push later in the week, on Friday, when he will travel to Indiana to campaign for Sen. Joe Donnelly Joseph (Joe) Simon DonnellyHarris faces pivotal moment with Supreme Court battle Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE, a moderate Democrat who could get a much-needed boost by a visit from the former vice president. He’ll also campaign alongside retired Marine Lt. Col. Amy McGrath, the Democratic nominee for Kentucky’s 6th Congressional District, at a local fish fry.

“Biden is one of the few Democratic candidates who can go into red districts and draw a crowd, and that is good for a potential candidacy, especially when everyone is running so far left,” the strategist said.