From the Wall Street Journal (which conducted the poll with NBC News):
Among Republican primary voters, Mr. Romney captured the support of 21% in a broad, nine-candidate field. Mr. Trump was tied for second with former Arkansas Gov. Mike Huckabee, with 17%. House Speaker Newt Gingrich got 11%, just ahead of former Republican Vice Presidential nominee Sarah Palin’s 10%. Former Minnesota Gov. Tim Pawlenty, considered a strong contender by political handicappers, remains largely unknown, with just 6% support. Rep. Michele Bachmann of Minnesota had 5%, former Pennsylvania Sen. Rick Santorum 3%, and Mississippi Gov. Haley Barbour with just 1%.