Democrats are leaving the door open for Hillary Clinton and former President Barack Obama to intervene in Senate races across the country.

Why it matters: Some Republicans, like Missouri's Josh Hawley, are already negatively tying Senate Democrats to Clinton, proving these Democratic figures might be more of a political liability than beneficial.

Driving the news: Senate Majority PAC President J.B. Poersch talked about Obama's late-game fundraising in past cycles, saying in an interview for C-SPAN's Newsmakers with Axios and the Washington Post: "I'm expecting president [Obama] is going to be helpful."

• The Democratic Senatorial Campaign Committee (DSCC) Chairman, Sen. Chris Van Hollen, said Senate Democrats will "welcome support" from Clinton and Obama, but added that every campaign "can talk to anybody who wants to help and decide who should come to the state and when."