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The Congressional Black Caucus led the charge in calling for a federal investigation into the case; they were eventually joined in that demand by President Obama and a number of top Republicans.

Rush continued his speech while the presiding officer, Rep. Gregg Harper (R-MS), repeatedly banged the gavel and told Rush to leave the chamber. When Rush failed to stop his speech, a representative from the Sergeant at Arms office approached Rush and walked out with the Congressman.

MSNBC
3/28/12

A full video of the incident can be found here