ten years ago when 55% of americans opposed same-sex marriage. once a hot button issue, politicians are reflecting this change in public opinion. when clinton campaigned for the presidency in 2008 like then-candidate barack obama she opposed marriage for gay couples. well, i m not in favor of gay marriage. reporter: clinton invoked god a reason to support same-sex marriage. to deny the opportunity to any of our daughters and sons, solely on the basis of who they are, and who they love, is to deny them the chance to live up to their own god given potential. reporter: even among republicans support for gay rights is increasing. the entire country is moving towards greater equality and inclusion and it is encouraging to see the republican party is addressing that. reporter: hillary clinton s statements put her in line with other likely democratic candidates for president in 2016. further fueling all that speculation about her political future. lana zach, abc news, new york.