Also... Carson/Trump 50/41
Trump/Bush 56/34
So in other words:
Rubio > Cruz
Cruz > Trump
Trump > Rubio
Voters make no sense.
That Rubio vs Trump number should be very concerning for the establishment. If I remember correctly, Rubio typically had a decent lead in head-to-heads against him.
That was the piece of data that leapt out to me, and it is concerning. If Trump hangs in there like this, it is going to get very ugly. Hillary must be pleased.
The overall picture suggests that there's a lot of soft support, and it doesn't break down into the lanes of establishment/outsider as is often described. If it did you'd see clear groupings in the head-to-head match ups. Until some real votes come in I expect polls like this to remain fluid.