Sara Taylor, a Republican strategist, former director of political affairs for President Bush, and Stephanie Cutter, Democratic strategist and communications director for Senator John Kerry's 2004 White House run.

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In the House, Bill Thomas, chairman of the crucial Ways and Means Committee and generally an avid tax-cutter, has made sceptical noises about Mr Bush's plan.

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Cutter will reprise the key behind-the-scenes role that Republican operative Steve Schmidt played for the Bush administration on the successful nominations of Chief Justice John Roberts and Justice Samuel Alito.

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