Why The Winners Of The Midterm Election Might Not Be Known Tuesday

Though Election Day is Tuesday, it might take some time to actually have race results because of different state voting rules.

Knowing who will control Congress by the end of the night Tuesday might be a far shot. Local, state and federal races might take some time to produce results.

But don't be alarmed if you don't know who won by the time you go to bed that night. There are many factors that could cause a delay.

"Different states have different rules for the hours of voting, for how they're tabulated, how the results are released," said Stephen Ohlemacher, Associated Press Election Decision Editor. "So, it is really a broad mix of different types of elections and different states."