I travel quite a bit on business and that's what I ee too.
Little trashed looking foreign cars will have various left-wing slogans with a Kerry/Edwards sticker on it.
And big old obnoxious SUVs will have Bush/Cheney on it.
No doubt the guy driving the little Honda or Toyoto is complaining about "outsourcing" even as their own consumer choices help encourage it. 
It does match up with demographics too in some ways.
For instance, married people tend to be Republicans. Single people tend to be Democrats. This is particularly true if they have children (single parents overwhelmingly Demcorats, married parents overwhelmingly Republican).
Another interesting stat which I wish I could find the source of so take it for what it's worth - volunteers at soup kitchens tend to be overhwelmingly Republican.