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.
Former Los Angeles mayor's decision makes Kamala Harris (D) a heavy favorite for open seat.
Former California Republican Party Chairman Tom Del Becarro has formed an exploratory committee for the seat, while Republicans continue to push former Rep. David Dreier (R-Calif.) to jump into the race as well.
The former Democratic governor will reportedly challenge Sen. Rob Portman (R) in 2016.
The former Wis. senator is Democrats' best hope to challenge GOP Sen. Ron Johnson in 2016.
The DSCC brought in $4.5 million — $2 million more than the NRSC last month.
The National Republican Senatorial Committee ended last month with $4.1 million in the bank.