A few hours before he debated Rep. Paul Ryan Thursday night, Vice President Joe Biden (or a 22-year-old campaign staffer in Chicago) sent the following message to supporters:
"I told Barack I have one mission tonight: tell the truth and stand up for what we believe in. Our side is always going to win when we do that."
Biden's team needed a win. Mitt Romney emerged from last week's debate with more momentum than he's had in nearly two years of campaigning. What do you think — who won Thursday night's showdown, Biden or Ryan?
Share your reactions to the vice-presidential debate below.