If you can get a magnetic sticker, you can place the bumper sticker on it. That way you can remove it when visiting enlightened liberal areas.
Now, where’s the fun in that??? I work in public education. While McJuan was not my choice in the Primary, I placed a McCain/Palin sticker on my vehicle for the General Election. It’s still there - and generates looks and a few comments. There’s a level of pleasure in working at a public school and parking my vehicle with the assorted military support stickers and the McCain/Palin sticker on it. The “Don’t Tread On Me” will fit right in with the other stickers.