LBJ had the motive and the means. He was notorious for dirty dealings.
I agree. He was so dirty, why the hell do you think he REALLY did not run for a second term? Duh?
Most Presidents find some way to make their last hours in office memorable in some way, even if only by pardoning felons. LBJ spent his last day trying to put together some kind of land deal in San Antonio for personal profit, IIRC.