I think the $45 mil figure included RNC fund raising for the month.
The RNC has raised significantly more than the DNC over the last few months as a result of making their pitch around just one candidate. The DNC has been holding back a bit until they had a candidate.
Political Party Fund Raising
It also allows McCain (and Obama) to truthfully say they wont accept PAC donations...they just steer them to the national committees.
Both parties also have Senate & House Campaign Committees and the Democrats are stronger here...which is very important to increase their majority in Congress.