Bush radio ads, phone calls, etc. were all part of the massive effort reminiscent of the way they got Arlen Specter over the top against Pat Toomey in 2004.
We can argue about immigration, John Jacob, LDS Church letters etc. but a lot of money and effort went into putting Cannon over the top. The money and effort coming from Karl Rove, the President and the GOP establishment.
They didn't want to be embarrassed by a Cannon loss and have their agenda set back which for better or worse includes keeping illegal immigrants in the country. The illegal workers are needed to satisfy the needs of the businesses that use them and contribute to political campaigns.
JMO, your screen name should be NextDUmmie.