As I wrote in the title, my boss brings up politics a lot in the workplace. I won't bring up my individual politics, but let's just say we differ significantly. Frequently he'll mention politics that he thinks will help his business. Sometimes this will be in group meetings, but it also happens when it's only me talking to him. To avoid an argument (and to avoid losing my job) I just nod my head and try to appease him until I can leave.
Recently, he began talking bad about a candidate and their policies that I strongly support. Soon I will even be putting a bumper sticker on my car in support of this candidate, which my boss will likely see. Forgetting about the bumper sticker for a moment, it seems to be getting harder to avoid political conversations. He seems to think everyone has the same views as him. I'm worried about what will happen if he realizes that I'm actually completely opposite of him on the political spectrum. Even if he doesn't see the sticker, it's likely he'll see me at some point outside of work wearing a political shirt or campaigning for my chosen candidate.
What can I do to keep work and politics separated?