It's the weekend. Kerry polls well on weekends.
As I posted in another thread, this is not supported by the data. Here are the average Bush leads in the tracking polls by day of the week over the last thirty days (updated since I posted yesterday):
Saturday 2.26
Sunday 2.60
Monday 2.00
Tuesday 1.93
Wednesday 1.22
Thursday 2.23
Friday 2.13
Bush does best on Sunday and worst on Wednesday, suggesting he polls well on the weekends and badly from Sunday-Tuesday.
Maybe I'm making a mistake, but it looks to me like your data actually sort of supports the notion Bush does poorly on weekends.
His lead on a Saturday is made up of the previous 3 days, correct? So that would be 3 weekdays. It looks like Sunday might drag him down through the first few weekdays.
