“Despite the historically large Democratic Primary field, it’s actually a three-way race in Arizona with Joe Biden showing strongest support among many demographic groups,” said Mike Noble, Chief of Research and Managing Partner of Phoenix-based research company OH Predictive Insights.

While Biden is leading state-wide, support varies across different parts of the state. More people (32%) in vote-rich Maricopa county say Biden is their preferred candidate — greater than the combined support for Warren and Sanders. However, further south in Pima County, the second-most populous county in the state both Biden and Sanders have double the support of Warren. Among the rest of Arizona’s 15 counties, Warren leads Biden and Sanders by 5 points and 4 points, respectively.