"As was said, we need a statewide officeholder."
Absolutely. If I were Secretary of State or AG or something and wanted to run for Governor in 2010 (when Mike Rounds is term-limited) I'd see defeating Herseth as my ticket to the 2010 gubernatorial nomination. The Lt. Gov. might as well run for reelection, since he would have a good chance of becoming governor in 2008 (assuming that Rounds runs for the Senate and defeats Tim Johnson), but for the other statewide officeholders this may be their best shot at something big.