There is one difference. I doubt Bernnie Sanders gave $50,000 to Rahm Emanuel.
http://www.politifact.com/punditfact/statements/2015/jul/09/ben-ferguson/donald-trumps-campaign-contributions-democrats-and/
Obviously, you've never been in business.
There were customers that I detested in various businesses I've worked at, yet I had to put on the pleasant face for them, in order to "do business".
You can't be a "purist" behind the counter - unless you don't care if there's a counter there next year, and you find that your business has been absorbed by that nation-wide chain - "Space Available".