A new poll from the Grand Canyon state shows Mitt Romney just 2 points ahead of President Obama, 42 percent to 40 percent. Eighteen percent are still undecided. The last time Arizona voted for the Democratic presidential candidate was for Clinton in 1996; before that, the state had consistently chosen the Republican candidate for nearly the past five decades. But the Obama campaign is keeping a close eye on the numbers; at a fundraiser last week, Joe Biden said, “We think we have a real shot at winning the presidential race here in Arizona.”