In some ways, Amin U. Sarkar’s conservatism makes sense. He’s a professor of economics at Alabama A&M University, where he tries to impress upon his students the importance of free-market trade to a thriving economy. He is against abortion and is the proud father of a United States Air Force veteran. He’s been supporting the Republican Party with his vote — and his money — for about 20 years, and like many Republicans, he says he’s eager for a candidate who is not mired in the Washington establishment.