I'd wager there are very few politicians that any company wants associated with their brand, and there's more than one reason for that. The obvious one, of course, is that politicians are inherently controversial, and an endorsement by someone on the right (or left) risks alienating your potential customers on the left (or right). Best to restrict your corporate politics to lavish, unpublicised donations and remain blandly apolitical in your public-facing stuff.
There's another reason, though, which is that politicians are nearly universally kind of awkward and off-putting, and they go about associating themselves with your brand then chances are the general public will start thinking your thing is awkward and off-putting too. Quelle horreur.
