Now there are two Senate Republicans backing same-sex marriage.
Sen. Mark Kirk, R-Ill., Tuesday announced his support. The center-right Republican recalled returing to the Senate in January after suffering a stroke, and how it impacted his decision.
"When I climbed the Capitol steps in January, I promised myself that I would return to the Senate with an open mind and greater respect for others," Kirk said in a statement.
"Same sex couples should have the right to civil marriage," he said. "Our time on this Earth is limited. I know that better than most. Life comes down to who you love and who loves you back--government has no place in the middle."
Sen. Rob Portman, R-Ohio, is the only other Republican senator to back same-sex marriage.