From USA Today:

The top Republican presidential candidates spent more than their Democratic counterparts in the first six months of the year, even though the Republican contenders raised less money, the latest campaign-finance reports show.

Republicans Mitt Romney, Rudy Giuliani and John McCain outspent Democrats Hillary Rodham Clinton, Barack Obama and John Edwards by more than $20 million, a USA TODAY analysis found. The three Republicans lag the top Democrats in total receipts by $40 million and have $61 million less in the bank.