Election officials in Arizona's most populous county may not be able to calculate vote totals by day's end, which could leave the presidential race up in the air.
Read More »Here’s why Democrats’ elusive dream of a blue Arizona won’t happen this year – unless…
With only a 6-point difference in voter registration between the GOP and the Democratic Party and more than one-third of voters registering as independents, some experts view Arizona as a potential swing state.
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