In this supposedly quiet off-year election, there are three contests taking place Tuesday that are filling the void. Voters in New Jersey and Virginia will elect a governor, while voters in upstate New York are filling a vacant House seat in a race with national implications.

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Here are some things to look for as the results come in.

1) The Nail-biter: There will probably be only one suspenseful race: the contest between Gov. Jon S. Corzine of New Jersey and his Republican challenger, Christopher J. Christie. A barrage of last-minute polls suggests that the race is too close to call, even after President Obama traveled to...