Why are the large numbers of Arizona mail ballots breaking for Trump and the Pennsylvania ballots breaking for Biden? A couple of reasons...
In Pennsylvania, most voters who requested mail ballots for the primary automatically had their requests renewed for the general. Since the Democratic primary was contested, there were a large number of Democrats who had their requests rolled over to the general
Of course, Pennsylvania election officials could not begin processing any mail ballots until election day. The large number of returned ballots heavily favor the Democrats 
In contrast, the Arizona mail ballots are more evenly divided by partisanship. Democrats returned their ballots earlier. Arizona election officials began processing mail ballots sooner, so the mail ballots returned later, and now needing to be counted, are more Republican
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