It was Donald Trump, at 34%, followed in second place by Jeb "Donald Trump Hurts Me" Bush at 31%, Cruz (who is tough on illegal immigration) at 30%, Rubio and Paul tied at 29%, Walker at 26%, Fiorina at 25%, Christie at 21%, and Huckabee and Carson tied at 16%.
Now, a big fat caveat is in order. This was not a poll in which the respondents selected the candidate they prefer, it was simply a favorability rating. Note that the highest Republican rating (Trump's) at 34% was not that high. The two leading Democrats did better among Hispanics. Hillary had a 50% favorability rating, with Bernie Sanders at 38%.
Nevertheless, taking that caveat into consideration, I think this is interesting and something to work with. Despite all the hysteria about Trump supposedly "losing" the Hispanic Vote, the candidate still had the highest of all (admittedly low) favorability ratings among Republicans.
Especially delicious is the fact that Trump's favorability rating among Hispanics was 3 points higher than Jeb "My Wife Is Mexican" Bush.
Regarding Trump and the Hispanic Vote, I'd like to see him (and other candidates) move away from the whole Latino Vote Paradigm and start appealing to Hispanics as Americans. I seriously doubt that Republicans would do any worse by doing so, and they might even do better.
See POLL: Trump Leads GOP Field Among Hispanics, Records 34% Favorability by Tim Dionisopoulos, MRC, July 27, 2015.