In the Progressive Review's average of recent polls, Clinton is statistically tied with all the GOP leaders.. Sanders is 9 ahead of Trump and 10 ahead of Cruz but is statistically tied with Bush and Carson.
One disturbing result from the lastest NBC poll. Carson leads Clinton by 13 points among independents. This may not be a sign not of ideology but of personality. Carson is apparently seen as more moderate in tone and more trustworthy. Clinton's style is not doing her any favors.
On the other hand, from a political perspective, Clinton is hurting her position by making such a big deal of gun control. This is an issue best left until after the election.