Super-PACs and political non-profits have opened the spending spigot on congressional elections spurred by fears the bruising Republican presidential primary has put the party's majorities on Capitol Hill up for grabs.
Outside groups from both parties have already spent a combined $34.1 million on races for seats in the Senate and House of Representatives, according to a Bloomberg News analysis of Federal Election Commission data. That's a 85 percent increase from the $18.4 million that had been spent by the same time in the 2012 elections.
