You are incorrect. Yes the Republican base has nominated right wing social conservatives, there is a difference between social and fiscal conservatism, however the electorate, including the less radical members of the Republican party have not voted for them enough to get them elected. Bush merely plays a social conservative and does enough to get by. Americans have never elected a true social conservative to the office of Presidency. As far as the shift to the left, the lack of support for Kerry should dispell that. Moreover look at who really put the Dems over the top in Congress. It wasn't really the liberal Dem candidates who only won in areas where the main election was the primary. In contests where there was actual competition it was the conservative or moderate Dems that carried the day not the liberals.

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The universe grows smaller every day and the threat of aggression by any group anywhere can no longer be tolerated. There must be security for all or no one is secure... - Klaatu