08/28/2010 05:12 am ET Updated May 25, 2011

Ken Buck Walks Back Controversial Statements, Begins Toning Down Rhetoric

He's questioned the constitutionality of Social Security, toyed with phasing out the federal student loan program and spoken of lowering the wall that separates church and state.

Meet Ken Buck, the Colorado Republican Senate primary candidate who looks like the next Rand Paul or Sharron Angle -- another tea-party-backed insurgent poised to upset the GOP establishment favorite.

Like Paul and Angle, whose post-nomination rollouts were notably rocky, the upstart Weld County district attorney carries with him similar made-for-cable-TV political baggage. And like those two, Buck's more unconventional statements haven't received a full vetting yet.

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