That's nothing. At least Arizonans are consistent. Look at WI. They elected their Senators in 2011 and in 2015. Each won by the usual margins (52-46 and 50-47). One was male, one was female. One was a Dem, one was a Pub. One is among the most anti-Trump voices around (Tammy Baldwin), and one is among the most supportive of Trump (Ron Johnson). Of the last 134 bills and motions where they both voted, they have voted the same way exactly twice... representing the same constituency, and yet voting in opposition to each other 98.5% of the time.
(Trump won WIS by 22,000 votes out of 2.8 million... 47.2% to 46.4%)
Tammy Baldwin is up for reelection this NOV, and is polling ahead 50-40 over each GOP opponent, Vukmir and Nicholson (they're in a dead-heat right now for next month's primary)... while the Republican is slightly ahead for the governor's seat (Scott Walker, who won in 2010, 50-46... survived a recall election in 2012 (53-46), and won again in 2014 (52-46)). Apparently, 46% of the Cheeseheads always vote for the DEM, but somehow Tammy Baldwin is getting an extra 4-5% more than every other DEM.
It must be the military thing.