Why is nursing Republican? Nurses are more monolithicly Labour than teachers over here.
Probably because of the influence of the AMA.
It's entirely anecdotal, but of all the medical professionals I know, they are very Republican. Unless they're Asian, of course. Ditto with other minorities, but in my experiences medicine has been dominated by whites and Asians, so in the end it balances out in favor of the Republican Party.
As to why? Not entirely sure, but probably a combination of high incomes + age + frustration with the ACA meddling in the healthcare industry (though many agree that there is a serious need for reform, it's more that they're mad about politicians [i.e.
lawyers] doing the legislating and "not listening to them")
Again, this is entirely anecdotal.