Democratic Representative Dennis Kucinich has launched his second bid for president — a long-shot candidacy fuelled by his frustration with his party's effort to end the Iraq war.

"I am not going to stand by and watch thousands more of our brave, young men and women killed in Iraq," Kucinich, considered a long shot, said Tuesday to applause from a crowd at Cleveland's City Hall. "We Democrats were put back in power to bring some sanity back to our nation.

"We were expected to do what we said we were going to do — get out of Iraq."

Kucinich is a six-term, liberal congressman from Cleveland whose presidential candidacy in 2004 made headlines more for being single and twice divorced, than for his policies. This time around, Kucinich is married.

Kucinich, 60, said he was inspired to run this time because he disagrees with how some of his fellow Democrats are handling the war, including approval of a proposal to spend $160 billion more on the conflict.

Kucinich joins Iowa Gov. Tom Vilsack, a fellow Democrat, in declaring his candidacy for the presidential nomination.

New York Senator Hillary Rodham Clinton is considered the party's front-runner, closely followed by Illinois Senator Barack Obama.

Neither has announced runs.

In 2004, Kucinich posted single digits in most primary elections, including his home state, yet stayed in the race.

He celebrated his bachelorhood on the campaign trail, telling New Hampshire audiences that he was seeking a mate.

Women vied for a date with him during an online contest, but no romance evolved from Kucinich's breakfast date with the winner. It did earn him appearances on late-night comedy talk shows.

Last year, he married Elizabeth Harper, then a 27-year-old consultant for a monetary-policy think-tank in Chicago.

He won re-election to his House seat in 2006 with 66 per cent of the vote, basing his campaign on job creation and criticizing rising gas prices. He also was an outspoken critic of his own party, saying Democrats have lost their soul by moving away from liberal ideals.

Kucinich was elected mayor of Cleveland at age 31, becoming the youngest leader of a major American city. He also became the mayor of the first city since the Great Depression to go into default.