Huge amount of independent expenditures today by the NRCC: $9.3 million.

Here are the biggest hits:

$424,948.80 against Democratic challenger Darcy Burner in the WA-8;

$571,073.60 against Democratic challenger Patrick Murphy in PA-8;

$657,276.80 against Democratic challenger Joe Sestak in PA-7;

$652,884.80 against Democratic challenger Lois Murphy in PA-6;

$579,187.60 against Democrat Zack Space in the race for Bob Ney's open OH-18 seat;

$521,985.88 against Democratic incumbent Rep. Melissa Bean in IL-8;

$436,881.00 against Democratic challenger Ron Klein in FL-22;

$417,933.39 against Democratic challenger Ken Lucas in KY-4;

A whopping 99% of today's expenditure was for negative advertising.