Sen. Daniel Akaka was one of four senators who didn’t vote on whether to advance the so-called Buffett rule on Monday, according to congressional watchdog govtrack.us.

Republican-led opposition blocked the bill, which was designed to increase taxes for Americans who earn income of more than $1 million per year. It’s fair to assume Akaka would have voted to keep the bill going since he co-sponsored it when it was introduced in February. 

DC808 could not reach Akaka’s spokesman via email, phone calls or text message on Monday night. 

Even if Akaka had voted, his vote alone wouldn’t have changed the final outcome. Attempts to move the proposal forward failed in a 51-45 vote. Others who missed the vote: Republican Orrin Hatch of Utah; Independent Joe Lieberman of Connecticut; and Mark Kirk, an Illinois Republican who is recovering from a stroke.

Hawaii’s other senator, Daniel Inouye, voted with his fellow Democrats to advance the Buffett rule.