Former U.S. Senator Mike Gravel (D-AK) is set to primary President Barack Obama from the left, according to the Daily Caller. Gravel says he’ll announce if supporters can manage to raise $1 million for a potential bid.

“Somebody should challenge Obama, there’s no question about it. He is what he is, and it’s not what we want,” former Alaska Sen. Mike Gravel said in an interview with The Daily Caller. “I’d be happy to do it, but it takes money. Without enough money to be heard, you come off as somewhat foolish.”

Gravel said he will challenge Obama if there is sufficient financial backing.

“If [supporters] would put up $1 million, I probably would run. And that would at least fund enough activity to get a message out,” Gravel said.

Other potential challenges from the left, according to Gravel: Congressman Dennis Kucinich (D-OH) and perpetual candidate Ralph Nader.