Pritzker is backing his lieutenant governor, Juliana Stratton, who was the first candidate to enter what's expected to be a crowded field to succeed Sen. Dick Durbin.
A number of party leaders are frustrated that Hogg, who has a leadership position in the party, is pushing primaries against some incumbents in deep-blue seats.
Stevens joins a Democratic primary with state Sen. Mallory McMorrow and former Wayne County health director Abdul El-Sayed, with ex-Rep. Mike Rogers running on the GOP side.
In his launch, Nathan Sage touts his background as a veteran, mechanic and sports radio announcer, pushing for a party that "people like me will actually want to be a part of."
The proposal was introduced in the Legislature after NBC News reported that DeSantis' taxpayer-funded staffers were soliciting campaign contributions during work hours.
A group of challengers stepping up against veteran Democrats in recent months are railing against the ways they feel the party has failed younger generations.
Georgia Gov. Brian Kemp, a Republican, hasn't yet decided on a Senate run, and former North Carolina Gov. Roy Cooper, a Democrat, won’t decide for a few months.