This quote from Judson Phillips, one of the Tea Party leaders says a lot, I think:
Phillips, however, said he isn't concerned about Tea Party-backed challengers not being competitive in November.
"I'm not that worried about the moderates.
Moderates are just people who don't have any core beliefs. They're neither liberal nor conservative -- they're just kind of there," he said. "I don't accept the premise that all moderates will automatically defect to the Democratic or liberal candidate. Some will, some won't."
And this guy is talking about Republican moderates!
http://www.cnn.com/2010/POLITICS/06/10/tea.party.primaries/index.html