Liberal activists livid at North Carolina's new constitutional amendment banning gay marriage want to pull the plug on holding the Democratic National Convention in Charlotte.
More than 26,000 people have signed a petition created by New York-based Gay Marriage USA to move the September convention out of North Carolina and to a "state that upholds values of equality and liberty."
Obama will accept the party's nomination at the event.
The ban, Amendment 1, passed on Tuesday. It defines marriage solely as a union between a man and a woman, making it the 30th state to adopt such a measure.
While the Tar Heel State already prohibited same-sex marriage, the proposal goes a step farther and doesn't recognize any type of legal union between couples that aren't married, including civil unions and domestic partnerships.