Math is hard.

And political math seems to be the hardest of all. For instance, there's the problem of estimating the crowd at a campaign event.

CBS reports that "A Dean staff member estimated Sunday night's crowd at between 1,400 and 1,600. A police officer said the rally occupied two-thirds of a gym that seats 850 people..."

Even harder is figuring out where your votes are. For instance, another CBS story has Dean aides holding forth that "Dean was strongest in Arizona and New Mexico." Maybe that's true, but they've got to hope their math is wrong. I haven't seen the New Mexico numbers, but in Arizona, Dean's polling fourth, with the top two slots in double digits ahead.

Of course, Trippi's hard count still shows an Iowa sweep...math is hard.