Most industries and sectors vote Republican. There are a lot of Democrats who stay at home and don't have to work due to large incomes or they're on welfare and food stamps. Working leads to conservatism. I've worked in grocery, retail, sales, fast food, construction, and office buildings. I have yet to find a liberal base of employees at any job I've ever had.
There are also a lot of Republicans that don't work in the a/m sectors, as they are housewives. Female professionals overwhelmingly voted Obama. Considering the gender gap, I think it is quite likely that the medical and airline industries leaned Obama, probably alongside sectors that are not on the list such as retail and beauty/wellness.
