ND: Mason-Dixon: Tied at 47%.

[I spent the winter writing songs about getting better]

It's a huge stretch to assume that all the oil workers are Republicans. I have met people here moving to the oil fields (which is funny considering how big ND->Minnesota migration was in when I was in high school), and we all know I don't know many Republicans. Many are not even citizens (my friend met her husband when he was here working for an oil transporter, and he's from South Africa), like with any low skilled manual labor job a bunch are probably illegals (which make up a lot of staff in retail and restaurants in North Dakota now, my brother used to work in the kitchen of a Chinese restaurant where he was the only fluent English speaker in the kitchen), and even those legal to vote might just not be very motivated if they are drifter types. That said anyone over 18 with an ND driver's license can vote if they opt to do so.