Here’s a news flash: Arlo Guthrie is a Republican.  Interviewed by the NYT here he said:

Where are you politically these days?
I became a registered Republican about five or six years ago
because to have a successful democracy you have to have at least two
parties, and one of them was failing miserably. We had enough good
Democrats. We needed a few more good Republicans. We needed a loyal
opposition.

The interviewer did not ask him how many drinks he had or what he had been smoking before he gave that response.