Which Is The Party Of The Rich?

According to this article, it's the Republocrats:

Princeton political scientist Larry Bartels studied the voting behavior of US senators in the early '90s and discovered that they respond far more to the desires of high-income groups than to anyone else. By itself, that's not a surprise. He also found that Republicans don't respond at all to the desires of voters with modest incomes. Maybe that's not a surprise, either. But this should be: Bartels found that Democratic senators don't respond to the desires of these voters, either. At all.

Neither party should be the party of "the rich" or of "the minorities" or of "the middle class". They should both be parties of "the Americans", and perhaps have different views on how to get to a similar goal. But I'm naive that way.