I think he overstates Vitter's vulnerability. Otherwise, it's not bad at all, although Dorgan and Grassley seem a bit arbitrary (maybe there because of retirement watch?).
Agreed on Vitter, and I'd have to imagine that all the "clear advantage" seats rely heavily on speculation and possibility.
If I had to edit further, I'd push Illinois into the Clear Advantage category, along with McCain. I'd otherwise put an asterisk next to New York's open seat and Delaware—both are almost guaranteed to go Democrat, but there is at least a scenario where either could wind up in competitive territory.
