Democratic congressman Dennis Kucinich has said he plans to run for the US presidency in 2008.
Mr Kucinich was also a presidential candidate in 2004
Mr Kucinich, who also made a bid in 2004, said he decided to run because the Democrats were not pushing hard enough to end the Iraq war.
The liberal, anti-war congressman from Ohio said Democrats had not acted on the message of voters in the mid-terms.
He said he disagreed with Democrats' approval of a proposal to extend $160bn (£81bn, 121bn euros) funds for the war.
"Democrats were swept into power on November 7 because of widespread voter discontent with the war in Iraq," Mr Kucinich said in a statement.
"Instead of heeding those concerns and responding with a strong and immediate change in policies and direction, the Democratic congressional leadership seems inclined to continue funding the perpetuation of the war."
Mr Kucinich's anti-war message was at the centre of his earlier presidential bid in 2004, when he was backed by several Hollywood celebrities.