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Just a regular American
Personally I think US flags should fly at half staff 24 hours a day to show respect for the soldiers fighting overseas. But according to the US law the flag should be at full staff since the Congresswoman was not killed. Technically it could be for the Federal Judge though.
US Code, Title 4 Chapter 1 § 7. Position and manner of display
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m. By order of the President, the flag shall be flown at half-staff upon the death of principal figures of the United States Government and the Governor of a State, territory, or possession, as a mark of respect to their memory. In the event of the death of other officials or foreign dignitaries, the flag is to be displayed at half-staff according to Presidential instructions or orders, or in accordance with recognized customs or practices not inconsistent with law.