The chart above doesn't reflect the support of each candidate among their party's voters, but the general opinion of them by the public as a whole. As you can see, Hillary Clinton and Ben Carson are viewed more favorably than any other candidates -- and are within 1 point of each other (well within the survey's margin of error).
These numbers are from a new Gallup Poll -- done between October 19th and November 1st. Between 1,884 and 2,014 people were interviewed for each candidate, and the margin of error is 3 points.