A poll of Arizona Republicans conducted last week but released today shows Donald Trump leading Ted Cruz 31 percent to 19 percent, with John Kasich and Marco Rubio tied at 10 percent.

The most encouraging news for Cruz is that the poll finds 30 percent of Republicans remain undecided. Late deciding voters have broken against Trump in almost every state that has voted so far. If enough of these voters and Rubio supporters back Cruz, he could pull off an upset and capture all of Arizona’s 58 delegates.

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