Ed Morrissey covered this and other revelations very well, give his article a read.
"Look, I know this probably sounds arrogant to say," the president said, "but I redefined the Republican Party."
I don’t think there’s any doubt about that last statement. Before Bush’s election, the Republican majorities in Congress had worked themselves into a role of fiscal responsibility and a check on Bill Clinton’s more expansive notions of government. After Bush took office, however, the two branches of government went on a spending spree, and not coincidentally a lobbyist lovefest, that threw out the GOP’s credibility on fiscal responsibility in six short years. Bush and his big-spending policies (and K Street strategy) set the stage for the Democrats to seize control of Congress in the 2006 midterms and a Democratic takeover of the White House last year.