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Hi Richard -- thanks for posting to History Hub!
To start, I can point you to this blog post we wrote on Videos of Congressional Hearings.
The first televised congressional hearing was in 1948 and the practice of filming wasn't formalized until 1970. Senator Richard Louis Murphy of Iowa served in the U.S. Senate from 1933 to 1936 -- here at the Center for Legislative Archives we have very little audio or video footage in our holdings in general, but we wouldn't have anything from the 1930s.
It looks like Murphy's personal papers are held in the special collections of the University of Iowa -- you may want to check with them. You can also reach out to the various film and television archival repositories we list in the blog post.
For more information on the National Archives Motion Picture, Sound, and Video Holdings I can link you to the landing page on the website.