I ran across this political cartoon I drew in, I'm guessing, April 1968. Robert Kennedy throws away a LBJ voodoo doll as he races Nixon to the Capitol. The American eagle looks wary while Gene McCarthy has dug a hole to stop RFK.
Johnson had dropped out of the race in March 1968, Kennedy was assassinated in June 1968. I'm not sure why LBJ makes that 3rd Party reference since by April Gov. George Wallace of Alabama had already announced he was running under the American Independent Party banner.
The drawing is too big to scan in one swoop. But here it is in pieces.