Washington (CNN) - If Arizona lawmakers have their way, President Obama might have to prove he's a U.S. citizen to get on the state's ballot in 2012.
On Monday, Arizona's House of Representatives voted 31-22 to advance legislation that would require presidential candidates to provide documents, including birth certificates, proving their citizenship.
The measure, an amendment to a state Senate bill, must now clear another vote in the House before going back to the Senate. If it clears both chambers, the bill could soon go to Arizona Gov. Jan Brewer, who is a Republican. Brewer's office declined to comment on whether the governor supports the proposal.
Critics deride the measure as a "birther bill." That name derives from a fringe movement, dubbed "the birthers," that questions whether President Obama was born in the United States despite proof that he was born in Hawaii in 1961. CNN and other news organizations have thoroughly debunked the rumors about the president's birthplace.
According to the Arizona legislation, parties seeking to put candidates on a state ballot would have to provide "documents that prove that the candidate is a natural born citizen, prove the candidate's age and prove that the candidate meets the residency requirements for president of The United States."
If the Arizona secretary of state "has reasonable cause to believe that the candidate does not meet the citizenship, age and residency requirements prescribed by law, the Secretary of State shall not place that candidate's name on the ballot," the bill states.
The amendment's sponsor, Republican Rep. Judy M. Burges, said through a spokesman that the bill is "an attempt to bring back transparency and confidence in the electoral process."
Rep. Kyrsten Sinema, assistant Democratic leader in the House, called Burges' amendment "crazy" but said it is likely to pass.
"This is just a political statement about our president, which is offensive," Sinema said. "They think that [President] Obama was born in Kenya, even though we have proof that he was born August 4, 1961, in Honolulu, Hawaii," Sinema said.
But Sinema predicted the measure would not pass constitutional muster. States have rarely if ever waded into this area. Arizona has "become the laughingstock of the nation," Sinema said.