I've thought long and hard about this question...
I think it's reflective of the large population of senior citizens who have moved to AZ for retirement. They're old school who just automatically vote for the (R) on any ballot. They don't follow politics as much they may have before and they think they are still doing the right thing.
I'm not talking about all of them of course, but I think it may be large enough to make a difference in AZ Senate races.
McLame, my Senator, also really milks his veteran’s POW status. The only reason he was re-elected this time is because the Rat alternative was so abhorrent.