Yes, the GOP is moving to the Right, which offers a far more expedient and, therefore, preferable antedote to the current socialist onslaught than that of some vague, undefined, dream of killing the GOP and (assumedly) replacing it with something else.
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There have been insurgent movements in American political parties before, of course. Goldwater conservatives broke with the party's mainstream in 1964, and antiwar liberals divided the Democratic Party during the Vietnam War.
Those earlier movements, like this one, aimed to change their own parties first, on the assumption that voters wanted a purer form of politics.
But here's what's different about DeMint and his allies: They are eager to target Republican incumbents, even to the point of challenging them in Republican primaries. In addition to calling out McConnell, the Senate Conservatives Fund has denounced Sens. Lindsey Graham (R-S.C.) and Lamar Alexander (R-Tenn.), all of whom will face tea party primary opponents next year.