Unfortunately, Ron Paul apparently didn't pony up the bucks or got turned down by Dennis Leary who does the voiceover for the F-150 ads. That aside the Ron Paul ad is definitely borrowing heavily from the Ford ads.
Take a look. Here's one of the F-150 ads:
Here's Ron Paul's ad:
And as if that wasn't enough, here is Conan O'Brien mocking the Ron Paul ad:
If only Ford would throw in a rusty pipe, I might consider a F-150...