Seeing as "Political Affiliation" isn't in that list of protected classes, does that mean that a private (i.e. non-government) corporation can legally say "I wo

Seeing as "Political Affiliation" isn't in that list of protected classes, does that mean that a private (i.e. non-government) corporation can legally say "I won't sell to you because you're a {Republican,Democrat,insert-your-party-here}"?