So far this election cycle, Dems had managed to have a slight edge in Senate campaign spending, but that gap appears to be closing in the final days of the campaign as many races are within the margin of error and control for the Senate is as uncertain as ever.
Among the most notable investments is the Senate Leadership Fund's spending in Wisconsin where Sen. Ron Johnson (R-WI) had been considered a goner throughout the summer, but has grown closer and closer to former Sen. Russ Feingold (D-WI) in recent days.
The PAC is also investing to keep a few prominent Senate Republicans alive in races where Republicans weren't expected to be so in jeopardy. In Missouri, for example, Sen. Roy Blunt (R-MO), a member of McConnell's leadership team, is in the political fight of his life against Democrat Jason Kander, who has painted himself as the outsider in an election where campaigns against Washington seem to be resonating
In North Carolina, the group is trying to keep Sen. Richard Burr (R-NC) alive after he stumbled earlier this week when he joked he was surprised to see Clinton's picture on a gun magazine without a bullseye over it.