John Yarmuth
US Representative from Kentucky (2007-2023); will not run in 2022
Michael Bennet
US Senator from Colorado
Joe Sestak
2020 Dem. presidential candidate, former US Representative from Pennsylvania, retired 3-star vice admiral
Sherrod Brown
Democratic US Senator from Ohio (2007-present); former US Rep from Ohio (1993-2007)
Jon Tester
US Senator from Montana (2007-present)
Claire McCaskill
NBC/MSNBC contributor, former US Senator from Missouri
Sheldon Whitehouse
US Senator from Rhode Island (2007-present)
John Kerry
68th US Secretary of State, Senator from Massachusetts