Usually this happens after the mid-term election of the second term -- during the start of the seventh year of an eight-year presidency.
Shockingly, the Bidens donated under $1,000 to all charities combined every year for the ten years prior to 2008.
The sixth year of a two-term president's administration is typically an opportunity for voters to send a message. It's not going to be a pretty message for Bush, if his popularity stays this low.