The Republican Main Street Partnership political action committee has endorsed Sen. John Sununu (R) in his bid to win a second term next year.

RMSP, a group that supports and funds centrist Republicans, also has backed former Rep. Jeb Bradley (R) in his bid to reclaim his old job representing the 1st district.

Sununu is bracing for a tough campaign next year, with the popular former Gov. Jeanne Shaheen (D) poised to enter the race. Several polls have shown that Sununu would lose to Shaheen by a wide margin if she runs against him.

Sununu closed the second quarter with $2.1 million on hand. The Democratic Senatorial Campaign Committee is expected to contest the seat heavily.

— David M. Drucker