The race for Senate control is very close and there's a significant chance that Americans won't know on election night which party controls the Senate.
It may even remain an open question until after the next Congress convenes on Jan. 3, 2015.
That uncertainty could spark chaos in the lame-duck session and hit pause on Senate Minority Leader Mitch McConnell's (R-KY) plans to redecorate the majority leader's ornate suite.
Forecasters roundly give Republicans an edge to win the net six seats they need to claim the Senate majority. The New York Times sees a one-third chance that the race will end in a 50-50 tie or be decided by a one-seat margin.
Here are four plausible scenarios that could push the Senate fight into overtime.
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