WASHINGTON --Four years to the day after voting to authorize war in Iraq, Senator John F. Kerry today asserted that the vote is his greatest regret of his political career, and said all lawmakers who voted for the war should admit that it was a mistake. "There's nothing -- nothing -- in my life in public service I regret more, nothing even close," Kerry, a Massachusetts Democrat, wrote in a dispatch on the liberal blog HuffingtonPost.com. "We should all be willing to say: I was wrong, I should not have voted for the Iraq War Resolution." snip...... Throughout his 2004...