If we had no information to go on, 25% would be the expected value. Right now, we have election results. In Ohio, Romney got 38.0% of the vote, so 4/10 wealthy votes isn't different from the Republican voters as a whole. In Tennessee, Romney got 28.0%, so 4/10 wealthy voters is a better performance. In Georgia, Romney got 25.9%, so 33.3% of wealthy voters is a better performance.
I don't see how the article is propaganda. The writer may not be a sophisticated consumer of statistics, but I don't see any obvious attempt to present a knowingly distorted picture.