Dan Quayle's moment of embarrassment. William Figueroa, 12, was the boy who knew how to spell "potato" even though the veep insisted on adding an "e" to the end. Just the other night on television, Jay Leno was poking fun at some gaffe by George W. Bush, whose picture morphed into a photograph of Dan Quayle on the screen behind the comic. Six years out of office with two failed presidential bids now behind him, ex Vice President Quayle still ranks as America’s favorite dumb politician because of what happened in Trenton on June 15, 1992. That’s the day, you...