There are a number of Democrats running for the US Senate or the Governorships who can be seen long term as potential future Presidential candidates if they win on Tuesday.
They would include the following:
Tim Ryan running for the Senate in Ohio
Mandela Barnes running for the Senate in Wisconsin
Josh Shapiro running for the Governorship in Pennsylvania
Wes Moore running for the Governorship in Maryland
Gretchen Whitmer running for the Governorship in Michigan (reelection)
J B Pritzker running for the Governorship in Illinois (reelection)
Gavin Newsom running for the Governorship in California (reelection)
Beto O’Rourke running for the Governorship in Texas