Why Geithner?

The National Review has some good questions as to why Tim Geithner's tax issues are bygones but Daschle's are an anchor.

If Daschle’s tax problems should bar him from managing the federal health-services bureaucracy and Killefer’s preclude her from scrutinizing the budget, how is it that Geithner’s transgressions—the worst of the lot—are insufficient to disqualify him from managing the same Internal Revenue Service whose attentions he evaded?

via Instapundit.