THIS IS INTERESTING:

Arlington, Va.: Is there any incumbent Senator of either party who would be a good bet to be defeated this time around?

Stuart Rothenberg: Only two are really vulnerable at this point: Lisa Murkowski (R-Alaska), who was appointed to her seat by her daddy, and Tom Daschle (D-South Dakota) who has a terrific opponent in John Thune and has lost the “clout” issue that saved his SD Democratic colleague, Tim Johnson, in 2002.

Strangely, however, he doesn’t mention the BlogAd factor. (Via Daschle v. Thune).

UPDATE: But the blogads seem to be working:

Howdy just a note to let you know that your Adblogs for Thune is working. I have never made a political donation outside my own little neck of the woods before today. Your site’s blogad gave me that “spur of the moment feeling” and I clicked the ad and made my modest donation to John Thune.

They certainly worked for Ben Chandler.