After about $1 billion spent on more than one million presidential campaign ads -- the vast majority negative -- the race enters its final days in the same way both campaigns predicted it would a year ago: too close to call.
Presidential debates have produced some of the most memorable moments of modern campaigns: A tanned and relaxed John Kennedy meeting a sweaty and pasty Richard Nixon in 1960. Gerald Ford denying Soviet domination of Eastern Europe in 1976. Al Gore sighing and rolling his eyes in 2000.
President Barack Obama was 1,600 miles away from delegates gathering at the Democratic National Convention, laying the foundation for a week in which he will draw sharp contrasts with Republican Mitt Romney.