Exceptional writing as usual, Vidal, though I thought McCain should have won Wisconsin rather easily.
Regarding the down ballot races, I had a suggestion, might Pat Toomey have beaten Arlen Specter in the GOP primary due to Conservative dissatisfaction with the Moderate incumbent? In OTL W barely rescued Specter from defeat, likely due to his stronger conservative gravitas than this TL's McCain. This could open up the possibility of Specter serving as AG in McCain's second term, as well as highlight the theme of alienation felt by the right wing of the GOP that will likely become apparent quite soon.
Additionally, I strongly believe McCain's winning the GOP nomination in 2000 would have butterflied Governor Mel Carnahan's death during the 2000 MO senate race. Is he currently serving in the senate? If so he could be a strong contender for the VP position in 2008.
And Toomey being the nominee could lead to Joe Hoeffel winning PA, and potentially PA going to Wellstone.