Some people thought Senator Kerry seemed like a snob, but President Bush seemed more like a regular guy/ a man of the people. (Down-to-earth is also good.)
A snob is someone who extraordinarally flouts his refinement, so the opposite would be someone below the standard. Probably more "a man of simple tastes" or "an ascetic" than just a simple hardy fellow. I certainly think of a snob as someone who shows off by boring you to death with minute details of whatever fixation nobody gives a flying **** about.