Obama pick to head Social Security runs into more trouble; Senate cancels confirmation vote

President Barack Obama's pick to head the Social Security Administration has run into more trouble after Senate Democrats canceled a procedural vote on her nomination.

Obama nominated Carolyn W. Colvin to a six-year term as commissioner in June. Colvin's nomination cleared one procedural hurdle in the Senate Saturday. However, Senate Democrats canceled an upcoming vote, making it likely Colvin won't get a vote until next year.

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Republicans take control of the Senate in January.

Colvin's nomination would have taken up valuable floor time as the Senate rushes to finish its year-end business. Senators could speed the process but that would require a bipartisan agreement.

A group of Republican senators is trying to block Colvin's nomination while investigators look into a $300 million computer project at the agency that doesn't work.