Does Obama Have A Fundraising Problem?

The WaPo suggests that the Obama campaign is relying too heavily on small donors. Patrick Caldwell complicates this analysis: 

Obama has outraised Romney and the other GOP candidates by wide margins to date, and Romney has been forced to waste more money on this prolonged nomination fight than most expected at the start of the year. Obama's campaign announced [Monday] that it raised $45 million in February alone. The clip of donations will only increase once the Republican nomination is settled and it becomes a clearly defined head-to-head race. The person writing a $50 check in February will probably be responsive to calls for a few more small donations between now and November, and those untapped contributors are the bulk of Obama's supporters.  

More on Romney's big donor problem here