Why do the following governors have such low approval ratings?

[Sam Spade]

Bob Taft - everything
Ernie Fletcher - dunno, this is Al territory
Matt Blunt - dunno either
Jennifer Granholm - bad economy
Rick Perry - Rick Perry rubs a lot of Republican Texans the wrong way, especially with that massive toll-road idea and some with re-districting too, though only people who are going to vote against him already care about the latter.  They will still vote him over any Democrat, but that's because the Democrats believe in nominating someone like Chris Bell, who no one likes.
About the poll, SurveyUSA is usually good in Texas, but I would be careful since this is a poll of adults, and I would bet that at least a third of the adults in Texas aren't registered voters, much less US citizens.
Ted Kulongski - Goldwater knows Oregon politics, I don't.
John Baldacci - Maine's economy sucks.
Haley Barbour - dunno
Ruth Ann Minner - I should know something about Delaware, but I don't.
Jim Doyle - dunno

I can only really help in Texas.