Space, Zack
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What you need to know to follow the battle for Congress.
Allied outside groups also make final push to Election Day.
Eager to keep Democrats on the defensive, GOP groups are planning a $50 million advertising drive.
The tactic could hurt Democratic turnout when the party needs to protect its majority in Congress.
Some question whether the money could have been better spent.
Joe Wilson raised the most campaign cash last year for his House re-election bid.
