BOSTON (CBS) – Former Senator Scott Brown announced Friday that he is not running for the open U.S. Senate seat in Massachusetts, according to the Associated Press.

Brown was elected to the Senate in 2010 in a special election following the death of Sen. Ted Kennedy.  But he was defeated in November by Democrat Elizabeth Warren.

Despite the loss, he remains popular in polls and he still has a statewide political organization.

When Sen. John Kerry was nominated to become Secretary of State, it set up another special election in Massachusetts.

Congressmen Ed Markey and Stephen Lynch are running against each other for the Democratic nomination.

The primary is April 30. The general election is set for June 25.