I have seen a bumper sticker that takes advantage of the misquotation that Romney uses.  Here is an antidote that you can print up and display yourself.

This prints nicely at landscape orientation on legal sizes paper. Click on the above image to view the full sized picture.
The fuller quote is in my previous blog, If you’ve got a business — you didn’t build that.

If you were successful, somebody along the line gave you some help. There was a great teacher somewhere in your life. Somebody helped to create this unbelievable American system that we have that allowed you to thrive. Somebody invested in roads and bridges. If you’ve got a business — you didn’t build that. Somebody else made that happen. The Internet didn’t get invented on its own. Government research created the Internet so that all the companies could make money off the Internet.