One poll:
"....Trump is running first with independent-leaning Republican primary voters, winning 19 percent of their support. And he captures about a quarter of GOP voters who say that they could not see themselves supporting Jeb Bush for president in 2016.
Those who say they consider themselves conservative are equally split between Trump and Walker, with about 18 percent backing each man.
And Tea Party supporters most favor Ted Cruz (22 percent), with Trump (20 percent) and Walker (20 percent) close behind."... Source
Makes sense!