Uh Jacob got a whopping 2% bump, while spending 6 times the amount Cannon's challenger did in 04 and focusing on the same issue, immigration.
Plus there was massive local publcity for this "immigration referendum" and the voters still gave a big yawn.
I for one could not understand why Cannon was even being challenged. That said, immigration is an issue that can be used for the GOP in the mid-terms. The House listening tour will confirm that.
If you go to Cannon's website, you will notice the prominent banner scrolling across the page, "Stop illegal immigration." Cannon was forced to demonstrate that he is a hardliner, enforcement first supporter on illegal immigration and secure borders. He obviously felt that his stance on immigration was a key factor in the primary. He didn't come out and support the Senate bill or the President's comprehensive reform approach.