Found in Maps of the Mind, by Charles Hampden-Turner:

A man was hitchhiking across the country just prior to a
presidential election and had hit upon a technique for getting
free drinks in bars by guessing which candidate was less popular
and then loudly badmouthing them. He went into a bar in Colorado
and yelled, Carter is a horses ass! To his surprise, he was
promptly thrown outside into the dirt. He picked himself up and
went into another bar, shouting, Reagan is a horses ass! Seconds
later, he was eating dust again.

Seeing a cowboy nearby, he called out, Hey, fella! If this aint
Carter country and it aint Reagan country, whose country is it?

The cowboy replied, Son, this is horse country!