As has been noted in the comments, a close study of Kelly's artwork is almost a tutorial in cartooning, or at least uber inspirational for cartoonists and animators. As such, we'll also attempt to gather and assemble material detailing Kelly's characters, which were numerous.
These Senator Bulfrog drawings are from 1969, and I don't know if it's a caricature of a specific senator or of the political species itself. Senator Everett Dirksen comes to mind, but he died a couple of months before these usages and didn't specifically resemble Bulfrog, except in ways of bombastic behavior.
Kelly gave Bulfrog a classic treatment with his own sort of flowery word balloons, as politicians tend to inflict upon us.
And it's always lovely to examine Kelly original art . . .
November 4, 1969