Since Eisenhower, which presidents have not been 'useful idiots'? I'd nominate Kennedy and Carter. Someone I respect said that Nixon hated the globalists, but he escalated the war in Vietnam (only ending it after his re-election), and I wasn't alive then so I don't know.
In recent history, Clinton continued G.H.W. Bush's free trade agenda. GW Bush couldn't even read a teleprompter. Obama was good at reading the teleprompter, but didn't have a good understanding of any of the problems he was supposedly addressing.
I think the real useful idiots are those employed by the traditional news media: CNN, NBC, ABC, CBS, etc. They lived in a little bubble, thinking that people really wanted four more years of the Reagan-Bush-Clinton-Bush-Obama status quo.