This nine-point advantage for Biden is a sign the former vice president continues to gain traction in a historically ruby-red state. After a December poll showed Biden trailing the president, capping off a summer and autumn of decline for the vice president, he jumped to a six point lead in March and has increased that margin an additional three points in the month since.

“What is interesting is the incredibly small margin between Trump’s ceiling and floor of support against Biden,” said Mike Noble, Chief of Research at Phoenix-based public opinion polling and market research company OH Predictive Insights. “Trump’s biggest pain-point is in Maricopa County and will need to triage that if he hopes to carry Arizona’s eleven Electoral College votes come November.”