RichardtiseiCharlie Baker, a moderate Republican running to become the governor of Massachusetts, has chosen State Sen. Richard Tisei, who is openly gay, as his running mate.  Baker issued the following on his Twitter account this morning:  ”Want you to be the first to know: I’ve chosen State Senator Richard Tisei as my running mate. Excited about this team.”  Tisei is the Senate Minority Leader, and played a key role in the fight to retain marriage equality in Massachusetts.

The Boston Herald reports:

Baker and the Senate minority leader will take on convenience store magnate Christy Mihos in the Republican primary. The winner is set to face off against state Treasurer Timothy Cahill and incumbent Gov. Deval Patrick in a three-way contest in 2010.

Tisei, of Wakefield, was elected to the House at age 22, the youngest Republican ever elected to the legislature, according to the Baker campaign Web site.