The man with the camera looks like Howard Baker, without his glasses. He would have been the Senate Majority Leader at that time, so would have fit in with others in the photo. He was an avid photographer. I agree, Leica CL seems most likely - hot shoe in the middle of the top and no rewind knob on the top of the camera.
If you can't fix it with a hammer... you got an electrical problem
even duct tape can't fix stupid.... but it can muffle it (SilentObserver) My Flickr -ipernity
Thanks CE Nelson