Build sheet indicated it was for Senator Vance Hartke.
From Wikipedia: "Rupert Vance Hartke (May 31, 1919 – July 27, 2003) was an American politician who served as a Democratic United States Senator from Indiana from 1959 until 1977. Hartke won election to the Senate after serving as the mayor of Evansville, Indiana. In the Senate, he supported the Great Society and became a prominent opponent of the Vietnam War. Hartke ran for president in the 1972 Democratic primaries but withdrew after the first set of primaries. He left the Senate after being defeated in his 1976 re-election campaign by Richard Lugar."