The Democratic Governors Association (DGA) is raising funds off efforts by opponents of President Obama who have questioned his place of birth.

The DGA sent out a fundraising appeal to supporters on Friday, referencing so-called birther bills being considered by some state legislatures.

"Republican governors, eager to score political points, keep these myths alive by refusing to unequivocally say that birtherism isn’t true and that they won’t sign any bills trying to undermine our president," reads the appeal from DGA Executive Director Colm O'Comartun. "Since they won’t act, it’s up to us to make sure they know the American people are watching."

The re-emergence of birtherism has been fueled by the recent start of the 2012 presidential campaign season, but the state bills helped contribute to its rise. 

Arizona Gov. Jan Brewer (R) recently vetoed a birther bill, but others are advancing in Louisiana and Indiana. Louisiana Gov. Bobby Jindal (R), has indicated he would sign one if it reached his desk, the DGA noted.

The birther bills would require presidential candidates to provide proof of their citizenship in order to be included on that state's ballot. 

Obama's opponents continue to question his citizenship — and thus his eligibility to serve as president — even though he released a copy of his birth certificate during the 2008 campaign to prove he was born in Hawaii.

The birther issue appears to be gaining steam with Republicans: 45 percent believe he was born outside the U.S., according to a recent poll.