I’m sure Leno is still liberal, but not to a degree that he does a Sergeant Schultz in the face of Libs’ and Progs’ hypocrisies or sillinesses. Besides, his profession and venue have him in constant need of fresh material, of which pols of all stripes are usually a good source.
Off topic: I wonder at the etymology of the metaphor, “of all stripes”. Does it refer to skunks? Traditional prison uniforms? Either would seem appropriate in this context, IMO.