That's the movie "Challenge" from 1974.
Directed by Martin Beck, Starring Earl Ownesby
Here's the Plot: "Frank Challenge is a man running for the U.S. Senate who will not sell out to the Syndicate. As a result of his strong stand against the mob, his family is murdered. Then Challenge becomes judge, jury, and executioner."
http://www.earlowensbystudios.com/ChallengePage.htmlHere's a long Trailer for the movie:
http://www.earlowensbystudios....indows/Challenge.wmv