Basically, Utah is considered in play for the same reason that Georgia and Arizona are considered in play, and for the same reason that Virginia and North Carolina seem to be going solidly towards Clinton:
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Demographic Changes
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Antipathy towards a historically bad candidate
Utah hasn’t experienced the large-scale demographic changes that Arizona, Texas and other states closer to the border have, but it has still been changing, particularly in the heavily populated Salt Lake Valley. While the state itself trends heavily Republican, Salt Lake City tilts relatively strongly in the other direction. Democrats routinely occupy the mayor’s office, and they recently elected their first openly gay mayor.
The state is still overwhelmingly white (88% as of the 2010 census, 80% white non-Hispanic - cite - PDF), but it has been trending away from that - it was 85% non-Hispanic white in the 2000 census. Utah has also been experiencing relatively rapid urbanization, with its big cities along the Wasatch Front attracting most of the state’s growth.
Although that demographic change has diluted Utah’s normal Republican tilt somewhat, the larger part of the shift in this election is Trump himself. Simply put, Mormons (62% of the population) despise Trump and everything he stands for. Mormons believe in literally staying married for eternity; Trump has been divorced three times. Mormons place a premium on civility and “sanitizing” their language; Trump is rude, offensive and unapologetically crude. Mormons feel an odd kinship with Muslims, and take religious liberty extremely seriously; Trump has promised to ban immigrants to the United States based on nothing more than that person’s faith.
I’m not a Mormon, but most of my family are, and this election has them incredibly divided. On the one hand, there’s 30+ years of history as one of the most reliable Republican states. On the other hand, there’s Trump.
I’d still be surprised to see Utah go to Clinton, but I don’t think it’s impossible. With McMullen, Johnson and Stein in the mix to give people alternatives to voting for Trump without voting for Clinton, I wouldn’t be shocked if Hillary ends up squeaking out a win with 33% of the vote. Surprised, but not shocked.