Good God. Look at these numbers from Politico:
If each of Obama's donors gave him a modest $250, he'd have $375 million to spend during the two-month general election sprint. That's $186 million a month; $47 million a week.
During the same September to Nov. 4th period, McCain will have about $85 million to spend since he has decided to take taxpayer money to help finance his campaign activities.
The Republican National Committee, which is charged with closing the gap between McCain and Obama, has $40 million in cash. Obama raised almost as much $31 million from just his small donors in the month of February. His total for the month, $57 million, exceeded the RNC's cash balance.
Obama has more than 1.5 million donors; McCain has a few hundred thousand. If just a million of Obama's donors sent him the maximum donation, $2,300, he could raise $2.3 billion.
Two quick observations: (1) Obama is going to be able to use that money to make random red states like Kansas and Idaho competitive enough that McCain has to put time, energy, and money into winning them. That's a huge advantage. (2) Obama could have enough money to finance every Democratic congressional race in the country. Certainly every key Senate race. He could essentially buy himself a filibuster-proof 60-vote majority in the Senate.