LOL. Please, I like Rush but this is delusions of grandeur.
Because we had our nominee so early,
McCain became the presumptive nominee winning just 31% of the primary vote, i.e., just before the "Potomac primaries" and after FL and SC. Even before McCain won the nomination, the Dems were out voting the Reps in the contested states by two and three to one.
It is simple. The Dem race between the Clinton(s) and Obama had seized the national limelight. They had 19 debates. Every single state came into play because the race was so tight. And the Dems are energized, a carryover from the 2006 midterms when the Dems regained control over Congress.
I had forgotten the medias obsession with the Clinton/Obama thing. I still think Operation Chaos had an affect. After OPChaos was in play, I think Obama only won one more primary. And that was after 11 straight wins.