funny that they need to vote on this - it's a fact that they were in contempt

House Democratic leaders “plan to force a vote as early as Thursday on holding Joshua B. Bolten, White House chief of staff, and Harriet E. Miers, former White House counsel, in contempt of Congress.” At the direction of the White House, Bolten and Miers last year refused to comply with subpoenas in U.S. attorneys probe.

(Think Progress)
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I obviously don't understand the legalities involved, but Bolten and Miers obviously were in contempt of Congress, why can't they prosecute them already?