That would be a compliment. Let me try some other possibilities. How about….
Senator Jeff Flake is an abject, bootlicking, brownnosing, chicken-hearted, compliant, cowardly, craven, effete, faint-hearted, feeble, fickle, flaccid, ingratiating, irresolute, kowtowing, lily-livered, mealy-mouthed, namby-pamby, obsequious, parasitic, pusillanimous, sniveling, spineless, submissive, sycophantic, weak, wimpy, yellow-bellied pile of dirty, doo-doo, poop and/or night soil.
There. That should get the point across and maybe even make it through even the most discriminating profanity filter.