A lot of these donors probably donated to the other side, too. "I won't do business with anyone who funds politicians I don't like, even if they also fund politicians I do like" is not necessarily a bad policy, but just be aware that that's what you're adopting if you choose to move your business away from these donors without also checking out the other side of the coin.
Thanks for putting together this spreadsheet! It would be cool to combine this with a campaign on Buycott (buycott.com) in order to target all these companies.
My goal with starting the google doc was to make it easier for people to target the companies that fund the politicians.
If everyone who sees this doc, fills in 2 rows, this will be done in a few minutes.