Live by the poll

. . . die by the poll:

According to a poll conducted June 18-19, Barack Obama had a 15-point lead over John McCain. A poll conducted July 25-27, however, showed McCain with a 4-point lead over the Democrat. Given this 19-point swing in favor of the Republican candidate over a period of 38 days, if the trend continues at the current rate, on what date will Obama's support reach zero?

That's from my latest column for the American Spectator, and you should definitely read the whole thing.