Jeanne Cummings does the math:

• 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. 4 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.