Bernie Sanders will campaign in Phoenix as he looks to recapture the momentum that powered his strong finishes in early states.
The Vermont senator's rally at the Arizona state fairgrounds Thursday evening will be his first since a surging Joe Biden grabbed the lead in delegates on Tuesday, turning the race effectively into a two-person contest.
Arizona's primary is March 17, but time is of the essence as Sanders looks to shore up support.
The overwhelming majority of Arizona voters cast their ballots by mail and are already making up their minds.
Biden has no public events scheduled in Arizona aside from a March 15 debate in Phoenix.