Hillary's Supporters Are Old, Uneducated, and Poor

This Des Moines Register article breaks down the supporters of the various Democrats running in the upcoming Iowa caucuses. Eric at Classical Values notes that Hillary has a problem attracting young voters, as shown here:

But what's especially intriguing is that Hillary's supporters are also the least educated and poorest. Since her supporters tend to be old, wouldn't you also expect them to be wealthier and more educated? This strange conflation doesn't bode well for her.

(HT: Instapundit.)