The poll said Tea Partiers were wealthier and better educated than the populace in general. But their poll methods were unreliable. In other words, they basically just polled Republicans.
If you look at the actual the survey results and methods, you’ll see that these “Tea Party supporters” are just people who answered affirmatively to the question “Do you consider yourself to be a supporter of the Tea Party movement, or not?” In fact, 78% (!!!) of these “supporters” have never attended a Tea Party rally or meeting or donated money to the Tea Party cause.