CAMBRIDGE, Md. - With two of his younger House colleagues mulling bids, Rep. John Larson (D), the Democratic caucus chairman, is ruling out a run for the Senate in Connecticut.

“I’m not getting into the race. That’s a definite no,” Larson told The Hill during the Democratic retreat in Maryland.

Larson, 61 and in his seventh term, is the fourth-ranking Democrat in the House. Rep. Chris Murphy (D) has already declared his candidacy for the Senate seat left open by Sen. Joseph Lieberman’s retirement, and Rep. Joe Courtney has said he is “seriously considering” the race.

Larson made a failed bid for the Democratic gubernatorial nomination in 1994, and he acknowledged he has considered running for Senate.

“I’ve given a lot of thought about it, and every time I think about it I think about how much I enjoy working in the House of Representatives,” Larson said.

He said both Murphy and Courtney would be “incredible senators,” though he won’t be making an endorsement. A former Connecticut secretary of state, Susan Bysiewicz, is running, and Ted Kennedy Jr., son of the late senator, is said to be considering the race.

“I’m sure the field might get very crowded,” Larson said.

The Senate vacancy is the second in as many years in Connecticut, after Sen. Chris Dodd (D) announced a year ago he would not seek re-election. Attorney General Richard Blumenthal (D) was immediately declared Dodd’s heir apparent, and he went on to win the race. This time around, however, there is no clear frontrunner.