Mike Huckabee led all potential candidates at 19%, followed by Mitt Romney (18%), Newt Gingrich (15%), and Sarah Palin (12%). Trump broke into double-digits as well, coming in at 10%.
Huckabee and Romney have led almost every national poll of the GOP field, with Palin and Gingrich rounding out the top-tier. Rep. Ron Paul has been the only other candidate to consistently poll near those top four. In CNN's latest poll, Paul placed behind Trump, at 8%.
In the CNN poll, Tim Pawlenty, Mitch Daniels, and Rick Santorum each garnered 3%, while Haley Barbour garnered 1%.
Trump has hinted at a presidential bid for several months now. In February, he spoke at CPAC, saying that he would decide on a possible White House bid by June.
The current TPM Poll Average shows that only 30% of the country has a favorable opinion of Trump, while 42.7% have an unfavorable opinion.
The CNN poll was conducted March 10-13 among 504 self-identified Republicans nationwide. It has a margin of error of 4.5%.