WASHINGTON — Twelve Democrats seeking the presidency tussled Tuesday night in a wide-ranging debate featuring the largest number of qualifying candidates on the same stage. Here’s a look at how some of their claims from Westerville, Ohio, stack up with the facts: JOE BIDEN: “I would not have withdrawn the troops, and I would not have withdrawn the additional 1,000 troops that are in Iraq, which are in retreat now being fired on by Assad’s people.” THE FACTS: The former vice president is wrong.