Such a call by Ahmed Abu Risha risks derailing Obama administration hopes that the March 7 parliamentary elections will bring stronger reconciliation between Iraq's majority Shiites and minority Sunnis who want to reclaim more political power.
It would also set back the clock on Iraqi politics - using the same protest tactic that Sunnis used in 2005 parliament voting that left them with only a few lawmakers and a weakened voice in key debates.
In an interview with The Associated Press, Abu Risha acknowledged that a boycott could throw Iraq into disarray. But the Awakening Council leader said the candidate blacklist likely will result in a low turnout among voters in Anbar, the mostly Sunni province that covers most of Iraq's western desert.
"They will not care about of the election - they will ignore it, maybe, if these decisions stand," Abu Risha said in an interview this week at his sprawling compound just outside Ramadi, about 70 miles (115 kilometers) west of Baghdad.
"I will make my decision later about encouraging people to go to vote or not," he added.
Abu Risha leads the Anbar province Awakening Council, a Sunni tribal militia that joined the U.S.-led fight against insurgents in 2006. Anbar was the birthplace of the uprising against al-Qaida in Iraq, which is seen as a critical turning point of the war.
Iraq's Shiite-led government has banned about 450 candidates with suspected links to Saddam's now-outlawed Baath Party. At stake in the March election is 325 seats and control of Iraq's parliament as the country prepares to stand alone when the U.S. military leaves at the end of 2011.
Iraqi officials say many Shiites also are banned from the ballot, but Abu Risha claimed the vast majority are Sunni
- reflecting fears that the blacklist is a government attempt to undercut Sunnis, who once controlled Iraq under Saddam and have felt politically marginalized since his ouster in 2003. U.S. officials say no more than 60 percent of the banned candidates are Sunni.
Iraqi President Jalal Talabani, a Sunni Kurd, has asked for a legal ruling on the legitimacy of the panel that is vetting the candidates.
Iraqi government spokesman Ali al-Dabbagh dismissed the threatened boycott as "futile."
"Many others called for boycotting the previous elections, and this has led to nothing and even loses," al-Dabbagh said. "Boycotting will not help and will not build a national project."
Sunni Arabs widely boycotted the last parliamentary election in January 2005 and now only hold about 75 of the current 275 lawmaker seats. Spurred by insurgent threats against voters and calls from hard-line clerics to skip the polls, many Sunnis shunned the election in protest of U.S. and other foreign troops in Iraq.