Reagan would be written off as RINO by today's GOP
Wrong.
Obama is already being written off as a Republican by the Democrats.
Oh, I'm not wrong at all. Let's see, Reagan granted actual amnesty (not the watered down Bush version of a pathway to citizenship, but actual amnesty) for 3 million illegal aliens. He loosened abortion restrictions as governor of California. He raised the payroll tax. He added $3 trillion to the national debt. He signed EMTALA. He forced states to raise their minimum drinking age to 21 by extorting highway funds from them if they refused, a violation of the Tenth Amendment.
Reagan is constantly hailed as a hero by conservatives, yet he was to the left of Marco Rubio, John Kasich, Chris Christie, and all these other Republicans conservatives keep claiming are not pure enough to receive the Republican nomination and label as RINOs or liberals.