AP reports that Republican outside groups are entering the House battle:
A late spending splurge by outside political groups helped Republicans take over the House two years ago. The floodgates are opening again, but this time Democrats say they're better prepared.
So far in 2012, Democratic groups have generally been able to keep pace with the competition. Outside groups have spent about $60 million trying to help GOP candidates since June 1 and about $49 million trying to help out Democratic candidates, according the Sunlight Foundation.
But some of the Republican support groups are just getting started. Beginning Saturday, Crossroads GPS, one of the deep-pocketed groups co-founded by Karl Rove, is launching a three-week, $8.1 million broadcast campaign in 11 House districts in New York to Michigan, Iowa, Illinois, Nevada, Indiana and California, according to Nate Hodson, the group's spokesman.
The Chamber of Commerce launched an $8 million ad campaign last week on behalf of 20 GOP candidates in close House races in California, New York and Illinois. It also weighed in for two Democratic incumbents. Until then, the chamber had focused most of its spending on Senate races.
American Action Network and the Congressional Leadership Fund, two Republican support groups led by former Sen. Norm Coleman, have spent about $3.1 million so far on House races. This week they said they will spend at least $13.5 million more during the campaign's final month.Crossroads GPS has a tough hit in Nevada 4:
Several GPS ads are variations of this one in New York 25: