Utah, the Mormon state, has had an interesting history in their voting patterns on the Presidential elections.
Coming into the Union in 1896, Utah voted for Democrat William Jennings Bryan that year; for Woodrow Wilson in his second term bid in 1916; for Franklin D. Roosevelt four times in 1932, 1936, 1940, and 1944; for Harry Truman in 1948; and for Lyndon Johnson in 1964 (over Barry Goldwater).
So if Utah goes for Hillary Clinton, which now seems likely, it will be the first time in 52 years.
With Utah politicians, including Senator Mike Lee, Congressman Jason Chaffetz, and former Governor Jon Huntsman condemning Donald Trump, and with Mitt Romney, the most famous Mormon and 2012 Republican Presidential nominee, being vehemently anti Trump from the beginning of the 2016 Presidential race, it is seen as a blow to Trump having any chance to keep that state loyal to the Republican Party, which is natural in the past half century. Realize that Romney won 3-1 over Barack Obama four years ago!