TAMPA (CBSMiami) – As recently as last week, Senator Bill Nelson’s office stood by his previous statements that marriage should be between a man and a woman. But last night, Senator Nelson changed his mind.

“If we are endowed by our Creator with rights, then why shouldn’t those be attainable by Gays and Lesbians?” Nelson asked in a statement to the Tampa Bay Times. “Simply put, if The Lord made homosexuals as well as heterosexuals, why should I discriminate against their civil marriage? I shouldn’t, and I won’t.”

READ MORE: Legendary 'Goodfellas' actor Ray Liotta dead at 67

Senator Nelson also said he would add his name to a Senate petition to the U.S. Supreme Court to “declare the law that prohibits gay marriage unconstitutional.”

READ MORE: BSO Investigates Fatal Crash In Dania Involving Motorcyclist

Nelson’s switch now puts the total number of Senators supporting gay marriage at 51. It also leaves just six Democratic Senators who don’t support gay marriage.

The six Democratic Senators not supporting gay marriage are: Joe Donnelly (Ind); Heidi Heitkamp (ND); Tim Johnson (SD); Mary Landrieu (La.); Joe Manchin (WV); and Mark Pryor (Ark). All six are from red states and several face re-election next year, which could be factoring in to the decision making process.

MORE NEWS: Haiti's contributions to South Florida in full display at Haitian Heritage Month Art Exhibition

Republican Senators Mark Kirk and Rob Portman have also expressed their support for gay marriage in the past.