Connecticut state Rep. William Tong is joining two other Democrats in seeking their party’s nomination in the 2012 race to succeed retiring Sen. Joe Lieberman (I), the Associated Press reported Sunday.

Tong made his announcement Sunday on WFSB-TV’s “Face the State.” Three-term Rep. Christopher Murphy and former Secretary of State Susan Bysiewicz have already announced their bids for the Democratic nomination.

Linda McMahon, the former wrestling executive who spent $50 million on a failed 2010 Senate run, is viewed as the top Republican considering entering the race for Lieberman’s seat.

Lieberman said in January that he would not run for a fifth term in 2012.