It's Election Day in the US. This so-called "off year" election doesn't feature presidential or congressional races, but there are still several critical votes to watch tonight. New York City will choose its next mayor, in a battle that has pitted a younger, progressive Democrat against a member of the party's old guard. The states of Virginia and New Jersey will elect new governors, and the outcome of these contests could be bellwethers for next year's congressional midterm elections.