Wis. Democrat will move home to "travel the state extensively" after leaving State Dept.
The vulnerable GOP senator is reaching across the aisle to back the Democratic mayor.
The former Maryland governor is considering a long-shot bid for the White House in 2016.
Several Democratic House members are eyeing the seat while GOP hopes to make it competitive.
The controversial 2012 GOP Senate nominee now says he won't challenge Sen. Roy Blunt (R-Mo.).
The Maryland Democrat is the longest-serving woman in congressional history.
Ashley Swearengin will not run to replace retiring senator.
An ad targeting Gov. Maggie Hassan (D) is running ahead of her potential Senate bid.
Controversial Missouri Republican says he's considering a primary against Sen. Roy Blunt.
The announcement sets up a fight between two of the most prominent Ohio politicians.