Rep. Barney Frank, D-Mass., the nation's longest serving openly-gay member of the House of Representatives plans to marry his partner, Jim Ready, in a Massachusets ceremony. A date for the event has not been set.

If he marries while in Congress, he'll be the first openly-gay member to be married while in office.

Frank, 71, announced that he would not seek reelection in November 2011 after an unusually close race against Republican Sean Bielat for the normally safe Bay State seat.

Same-sex marriage became legal in Massachusetts after a state Supreme Court decision in 2004.