I think this is supposed to be a combination of Nixon and Agnew, but I'm not sure.
Jack Sparling did a lot of work for mainstream comics and humor magazines. In his final years, he was the editor of SICK, which by that time was owned by Charlton and apparently paying contributors with copies. The most cash-strapped alternative publishers I've worked for don't even do that.
This was the inside front and back cover.
When THE GODFATHER came out the makers took great pains to let the audience know wasn't meant to represent all Italian-Americans. This parody reducing them to the pizza-box stereotype and the humor coming from that would probably be more offensive to them.