Democratic National Committee Chairwoman Debbie Wasserman Schultz attributed Obama's strong showing to Republican support for the state's controversial immigration law.

"Arizona is beginning to get very close to being in play, if not already in play. And that's particularly because Mitt Romney is — has the most extreme position on immigration of any presidential candidate in history," Wasserman Schultz  (D-Fla.) said on CNN.

"There is a backlash that's starting to show in Arizona, and we're organizing there, making sure that we reach out to the Latino community, to the grass roots, to women, to the middle class and working families who understand that President Obama's been fighting for them."

Last week, Vice President Biden said his ticket had "a real shot of winning" Arizona while campaigning in the state.

A Public Policy Polling survey also released Wednesday showed nearly six in 10 Hispanic voters in the state said Romney's support for the law made them less likely to vote for him. According to the Rocky Mountain poll, Obama holds a 39 percentage point lead with Hispanic voters and a 16-point lead with independents.

But Republicans continue to express confidence in their ability to hold the state.

“The Obama team is setting up a mirage that somehow Arizona is going to be an Obama state or in play,” Repunlican National Committee Chairman Reince Priebus said in a conference call with reporters last week. “It’s a Republican state, it’s a red state. We’re going to be there, obviously it’s not going to be ignored at all, but to put it in the category of a targeted or battleground state is a mindset that we’re not adhering to right now.”