What you might have missed “At the Races” on Tuesday …

• #MTsen: All eyes are on former Gov. Brian Schweitzer to see if he runs for the Democratic nod in Montana. Sen. Max Baucus, D-Mont., suddenly announced his retirement Tuesday morning, and soon after a top Democratic official confirmed that Schweitzer was already considering the race.
• #HIsen: Rep. Colleen Hanabusa will likely challenge appointed Sen. Brian Schatz for the Democratic nomination in 2014. Notable timing here: Hours earlier, the Democratic Senatorial Campaign Committee indicated it would support Schatz.
• #SDsen: Democrats remain divided over who should run for the open Senate seat: U.S. Attorney Brendan Johnson or former Rep. Stephanie Herseth Sandlin. Neither has announced a campaign yet. Meanwhile, former Sen. James Abourezk joined the “Draft Brendan Johnson” movement.
• Shop Talk: A top GOP ad-maker, Nick Everhart, was fired from Rex Elsass’ firm via an email late on April 20.
• Shop Talk: A former campaign manager for Sen. Joe Manchin III has joined the new Democratic consulting firm Mack-Sumner. That firm sound familiar? Earlier this year, conflicting interests split Kevin Mack’s longtime partnership with Jim Crounse and the direct-mail firm Mack|Crounse Group.

What we’re mulling on Tuesday …

• #GAsen: Will there really be two Democrats brave enough to run for Senate in Georgia in 2014? Local Democrats hope to settle on a nominee rather than a primary between Rep. John Barrow and Michelle Nunn, the daughter of former Sen. Sam Nunn, D-Ga., according to the Atlanta Journal-Constitution. Both Democrats are considering bids to replace retiring Republican Sen. Saxby Chambliss.
• #KYSen: Rep. John Yarmuth, D-Ky., keeps talking Democrats who could challenge Senate Minority Leader Mitch McConnell (via Louisville affiliate WDRB). Meanwhile, Secretary of State Alison Lundergan Grimes continued to mull a bid via the Courier-Journal.
• #IASen: Republican Lt. Gov. Kim Reynolds will not run to replace retiring Democratic Sen. Tom Harkin, via NBC News. Your move (still), Rep. Steve King.
• #SC01: Talk about return on investment: The Democratic Congressional Campaign Committee is raising money off former Gov. Mark Sanford’s troubled special-election bid. The committee sent a fundraising email to supporters just days after it started making independent expenditures on its nominee’s behalf.
  Also, Sanford went up with a new ad tying Democrat Elizabeth Colbert Busch to labor and House Minority Leader Nancy Pelosi:

https://www.youtube.com/watch?v=549fQMhDg-4