When I head to Arizona for a burger, there seems to be some major political upheaval going on. The last time I reviewed a burger in Phoenix, President Obama had just been inaugurated and this time around, we've got news of a state law that seems almost certainly unconstitutional. I'm not jumping into a political discussion this go 'round, but while we're on the topic of what defines "American," let's talk about what makes an all-American cheeseburger. I tried a new spot in Phoenix called Zinburger. More