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Mr. Williams, chairman of the powerful Transportation Committee, was one of two moderate Republicans to fall. J. Brandon Bell II, Roanoke Republican, was the other.

This month’s primary was the second consecutive primary in which anti-tax conservatives attacked incumbents who supported the 2004 tax increase. In 2005, anti-tax groups tried to unseat six delegates who supported the tax increase. One conservative, Chris Craddock, won, knocking out a Republican delegate in the primary. But he lost the general election to Democrat Chuck Caputo in the 67th District, which includes parts of Fairfax and Loudoun counties.

Republicans hope to avoid a repeat this year.

“The [anti-tax conservatives] can have a lot of influence in a small turnout primary, but they tend to get swallowed up in the General Election,” Mr. Callahan said.

Mr. Wade said he is not too concerned about a Democratic challenge to Miss Stall. “I think the governor would be better off spending his money somewhere else,” he said. “We will protect this seat.”