Would someone who's truly a straight-talker need to ride in a circus train named "the Straight-Talk Express"?

Would someone who is really a straight-talker need to resort to those kinds of gimmicks? And why does McCain go around endlessly boasting that he's humble and never brags about himself? Can't republicans see the contradiction there? He's always shamelessly selling himself to the public about how's he's a "1) humble, 2) straight-talking, 3) maverick-like, 4) war-hero POW who also has 5) integrity!" He never misses an opportunity to tell the public that, just like Rudy Guiliani never misses an opportunity to talk about 9/11. In every television appearance, he'll drill those marketing points in. Why in the world do republicans fall for it every time?