Sens. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) and Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.) will be in Iowa over the next few days to campaign for Democratic candidates, giving them a chance to distinguish themselves in front of voters in a state that will hold the first-in-the-nation caucuses in February 2020.

The two high-profile senators will be in the Hawkeye State to campaign for Democrats running for congressional seats and state offices in the Nov. 6 midterm elections. While neither lawmaker has announced they will run for president, the visits put them in front of voters who will play a crucial role in shaping the 2020 primaries.

“This is the time when you have to begin to come to Iowa,” said Iowa State University political science professor Steffen Schmidt, adding that candidates “have to capture a good number of Democrats who will be attending the caucuses.”

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Having a strong organization is important to succeed in the caucuses, he said, since candidates need people to show up and support them in every precinct.

The visits by Sanders and Harris are part of broader efforts to campaign for Democrats in the midterms. Iowa is part of a nine-state tour for Sanders, and Harris will be there after stops in South Carolina and Wisconsin.

Sanders is scheduled to be in Iowa on Saturday and Sunday. He will campaign for former professional baseball player J.D. Scholten, who is running against GOP Rep. Steve King Steven (Steve) Arnold KingTrump, Biden deadlocked in Iowa: poll GOP leader: 'There is no place for QAnon in the Republican Party' Loomer win creates bigger problem for House GOP MORE, a prominent immigration hardliner, in Iowa’s 4th Congressional District. The race is rated “likely Republican” by the nonpartisan Cook Political Report.

Sanders will attend several events with Scholten: rallies in Sioux City and Ames; a town hall focused on Social Security; and a homecoming parade at Iowa State University. The rally in Ames will also include Deidre DeJear, who is running for Iowa secretary of state and is the first black major-party nominee for a statewide office in Iowa.

Harris is scheduled to visit on Monday and Tuesday, participating in early voting rallies in various locations in the state, including the Des Moines area and Cedar Rapids.

A number of those events will be held on college campuses, including a rally at Des Moines Area Community College with congressional candidate Cindy Axne and a couple of candidates for state legislature. Axne, a small-business owner, is looking to unseat GOP Rep. David Young David Edmund YoungEric Idle threatens to sue GOP committee over use of Monty Python song in ad Trump: DeJoy should be removed if it 'can be proven that he did something wrong' The Hill's 12:30 Report - Presented by Facebook - Trump's Labor Day news conference MORE in Iowa’s 3rd Congressional District — a race rated a “toss-up” by Cook.

Iowa could be a key state in Democrats’ quest to take control of the House. Democrats need a net gain of 23 seats to win the majority, and there are three GOP-held congressional districts in Iowa that could flip. In addition to the races involving Scholten and Axne, state lawmaker Abby Finkenauer is running against Rep. Rod Blum (R) in the 1st Congressional District in a race Cook rates as “lean Democratic.”

There are also state-level races that Democrats are hoping to win, including DeJear’s and the gubernatorial one.

DeJear spokeswoman Cynthia Sebian-Lander said it’s important to get students excited about the upcoming election and that it helps to have big names help with the campaigning.

“Lots of early voting locations are going to be open next week, so it’s a great time to visit,” Sebian-Lander said.

The midterm campaign trips also give possible presidential candidates the chance to test out messages and connect with people who might help their eventual campaigns.

Sanders has experience campaigning in Iowa. He narrowly lost the 2016 Iowa Democratic caucuses to Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE.

Harris, however, isn’t very well known in the state. This will be her first visit to Iowa since the 2008 presidential cycle, when she campaigned for then-Sen. Barack Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa MORE during her tenure as San Francisco district attorney.

Sean Bagniewski, chair of the Polk County Democrats, said Harris’s visit gives her an opportunity to introduce herself to Iowa voters.

“There’s a draw and anticipation of meeting her for the first time,” he said. The Polk County Democrats are hosting an event with Harris and DeJear on Monday, and Bagniewski estimated that about 500 people will attend, more than initially expected.

Prominent Republicans have also been showing up in Iowa in advance of the Nov. 6 midterm elections. President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE visited earlier this month, and Vice President Pence made the trip on Friday.

Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.), who’s retiring from Congress in early January, will be in Iowa on Tuesday to campaign for Young. He’s also expected to campaign for Blum before the midterms.

Harris and Sanders are not the only possible Democratic presidential candidates making stops in Iowa this month.

Sens. Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (D-N.J.) and Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D-Ore.), as well as Washington Gov. Jay Inslee (D), have made visits to the state in recent days and weeks, and Colorado Gov. John Hickenlooper (D) has been spending part of this weekend in the state.

Hickenlooper spoke on Friday at the World Food Prize symposium in Des Moines and headlined meet-and-greet events to support state legislature candidates. He is participating in canvas kickoff events Saturday with the Iowa Democratic Coordinated Campaign, said Brad Komar, executive director for Hickenlooper's leadership PAC.

Having Sanders, Harris and Hickenlooper in the state over the course of a few days is just a taste of what’s in store between now and the Feb. 3, 2020, caucuses.

“It’s going to be busy, for sure,” Bagniewski said.