I don't mean to say that there is no anti-incumbent feeling abroad in the land--there is. We saw that in Utah, where Bob Bennett (R. UT) was swept from office. Will that feeling last to November? There, we have doubts.
For one incumbent, Blanche Lincoln (D. AR), things do not look good, however. Check this graph of her poll numbers vs. those of her Democratic challenger, Lt. Gov. Bill Halter.
Lincoln does not have until November to see if hostility to incumbents fades; the primary run-off will be held June 8th.