If you want to go to a fast food restaurant where other customers share your political views, here is the list
This list was put together by the Wall Street Journal. Interestingly, Liberals congregate in only three fast food restaurants. Conservatives appear more spread out. Conservatives don't dominate any restaurant the way that Liberals do -- CHIPOTLE and AU BON PAIN. If you include a restaurant where Liberals are just as likely as not to go to (a rating of 100), you would get a third restaurant: Jack-in-the-box. By contrast there are six restaurants where Conservatives have a rating of 103 or higher and nine where they are above 100.
It would be interesting to see how Starbucks was for conservatives before their meaningless statement of asking people not to bring guns into their restaurants.