President's job approval rating is falling again

The President has been busy mischaracterizing the Arizona immigration law, and John Hinderaker of Powerline sees a connection to the President's attacks on Arizona and his falling approval rating:

Meanwhile, President Obama's approval rating among likely voters has been falling. Maybe it's random variation, but I can't think of anything Obama has done over the last couple of weeks that would cause his ratings to drop other than his repeated attacks on the people of Arizona, and, by implication, the majority of Americans who support Arizona's effort to enforce the immigration laws. Perhaps Obama doesn't realize that it was President Bush's promotion of "comprehensive immigration reform" that sent his approval ratings into the deep-freeze during his second term.