The race will be called before Arizona.
Arizona would just be gravy in 2016, and also a giant wake-up call to the Republican Party that if they continue down the path of Trumpism at a national level, NV/CO are locked down for the Dems, FL/NC start turning lean Dem, AZ is turning solidly purple, and even TX is in danger....
Not even to speak of #BattlegroundTexas
Trump could actually win Texas by single digits this year, but I do not think that the Republicans have too much to worry about in Texas if they nominate some normal candidates. Hispanics there are much more conservative than they are nationwide, and they do not have high turnout anyway.