ABC/Washington Post: Romney & Palin lead the pack

[Tender Branson]

(ASKED OF LEANED REPUBLICANS) If the 2012 Republican presidential primary or caucus in your state were being held today, for whom would you vote? (OPEN END; SINGLE RESPONSE) Which candidate would you lean toward?

21% Romney
17% Palin
  8% Giuliani
  6% Gingrich
  6% Paul
  4% Cain
  4% Pawlenty
  3% Bachmann
  3% Perry
  1% Christie
  1% Daniels
  1% Huckabee
  1% Huntsman
  1% Santorum
  3% Others
  5% None of them
14% Undecided

http://langerresearch.com/uploads/1124a2_2012_Politics.pdf

[Poundingtherock]

So this poll is an "open-ended" poll but there's still an option for "none of them?"

Does that make any sense for that to be a response to an open-ended poll?