But after lengthy study of the phenomenon, I’ve concluded that the whole miserable narrative boils down to one stark fact: They’re full of shit. All of them. At the voter level, the Tea Party is a movement that purports to be furious about government spending — only the reality is that the vast majority of its members are former Bush supporters who yawned through two terms of record deficits and spent the past two electoral cycles frothing not about spending but about John Kerry’s medals and Barack Obama’s Sixties associations. The average Tea Partier is sincerely against government spending — with the exception of the money spent on them.

Matt Taibbi writes about his time with the Tea Partiers in Rolling Stone.
Edit: Here’s another great quote:

It’s not like the Tea Partiers hate black people. It’s just that they’re shockingly willing to believe the appalling horseshit fantasy about how white people in the age of Obama are some kind of oppressed minority. That may not be racism, but it is incredibly, earth-shatteringly stupid.