William Saletan and Jacob Weisberg have a great piece on why the Bush Cheney Hitler ad is not only a shameless and deplorable bit of muckraking garbage, but it's a sign of a truly desperate campaign, if not complete delusion.
Saletan finds it truly disgusting, while Weisberg finds it so ridiculous as to be almost "camp." Weisberg nails it with this:
But in reaching so far down so early in, Bush has not improved his prospects. Aimed as it is at the surviving members of various John Birch splinter organizations, this ad will win over no one, while alienating and offending many potential Bush supporters. Republicans will spend much time on the defensive trying to explain why their ad is not as revolting and preposterous as it obviously is.
Really, what the hell were they thinking? I have to admit, the judgement they display is rather encouraging.