Blair was elected as a Unionist from Virginia to the Thirty-seventh Congress to fill the vacancy caused by the resignation of United States Representative John S. Carlile.

He was then elected to the Thirty-eighth Congress from West Virginia, serving from December 7, 1863 to March 3, 1865.

He died in Salt Lake City and was interred in Mount Olivet Cemetery there.

This article incorporates public domain material from the Biographical Directory of the United States Congress

This article about a member of the United States House of Representatives from Virginia is a stub.