Democrats have been outspent 7:1 recently:
The $80 million spent so far by groups outside the Democratic and Republican parties dwarfs the $16 million spent at this point for the 2006 midterms. In that election, the vast majority of money – more than 90 percent – was disclosed along with donors’ identities. This year, that figure has fallen to less than half of the total, according to data analyzed by The Washington Post.