MASSACHUSETTS: “Alan Khazei has become the first high-profile Democrat to enter the race to challenge GOP Sen. Scott Brown in Massachusetts,” Roll Call reports.

MISSOURI: “Ann Wagner, a former ambassador and former co-chairwoman of the Republican National Committee, announced Tuesday that she is exploring a run for Congress, if Rep. Todd Akin (R-Mo.) decides to run for Senate,” Roll Call reports.

NEVADA: Republican Sharron Angle says she’ll run in 2012 but not as an independent.

NORTH DAKOTA: “Rep. Rick Berg is very seriously considering a run for Senate in North Dakota and is even likely to make the race, according to sources close to the freshman Congressman,” Roll Call reports.