1. Read 200 books this year
2. Mensa member
3. Top decile SAT score
4. Won Pulitzer Prize
5. High school valedictorian
6. Solves Times Crosswords with a pen
7. graduated Summa cum Laude
8. Earned two PhDs

Kirstie Alley, actress
Scott Baio, actor
Stephen Baldwin, actor
Gary Busey, actor
Lou Ferrigno, bodybuilder
Jerry Lewis, comedian, actor, producer
Sylvester Stallone, actor
Jean-Claude Van Damme, Belgian actor
Fred "The Hammer" Williamson, actor and former football player
Mike Ditka, retired NFL player, coach and television commentator
Hulk Hogan, former professional wrestler
Dennis Rodman, retired basketball player and television personality
Mike Tyson, former boxer
Ann Coulter, political commentator
Charlie Daniels, singer, songwriter
Loretta Lynn, singer-songwriter
Wayne Newton, entertainer and singer
Ted Nugent, musician
Kid Rock, musician
Kenny Rogers, singer-songwriter
David Duke, former Ku Klux Klan Grand Wizard
Paula Jones, former Arkansas state employee
Rick Perry, former Texas governor
Dick Cheney, 46th Vice President
Trent Lott of Mississippi
Chris Christie, New Jersey
Paul LePage, Maine
Rick Scott, Florida
Jan Brewer, Arizona
Sarah Palin, Alaska

ANSWER KEY:
None of the above.  It was a trick question.
They have in common that they endorsed Donald Trump for President.

(See the complete list in Wikipedia.)

It seems they are not the sharpest tools in the shed.  Should we worry about this list?  Normally morons do not turn out to vote in substantial numbers.  But this year The Orange Dumpster is aiming his appeal specifically at under-educated and dim witted people.

And how many below-average voters are there?  Statistically they amount to fifty per cent of the electorate.
Minus one.