Quinnipiac University poll:
http://www.quinnipiac.edu/news-and-events/quinnipiac-university-poll/national/release-detail?ReleaseID=2324Briefly:
For every single head-to-head matchup (Clinton/Sanders vs Trump/Cruz/Rubio/Bush/Kasich), Sanders wins all of them (with a statistical tie against Kasich) and Clinton loses all but Trump (and she's in a statistical tie with him) and isn't even in a statistical tie with Rubio and Kasich. Even putting Bloomberg in as an independent doesn't quite change things in the two cases they polled: Sanders-Trump-Bloomberg sees a tie between Sanders and Trump, and Sanders-Cruz-Bloomberg still has Sanders winning outside the margin of error.
Sanders has a 51% favorability rating to 36% unfavorable. Only Kasich (35-18) and Rubio (39-37) have higher favorability ratings than unfavorability ones; every other candidate has a higher unfavorability rating, with Clinton's and Trump's above 50%.
When it comes to whether people think the candidates are "honest and trustworthy": more than half say yes for Sanders, Bush, and Kasich, more than half say no for Clinton, Trump and Cruz, and Rubio is at 47% yes and 41% no.
"Strong leadership qualities": More than half think Clinton, Trump and Sanders do. No candidate polled over 50% no on this question. Bush and Kasich had more "yes" than "no," Rubio was the reverse, and Cruz had a tie.
"Cares about the needs and problems of people like you": Only Sanders polled above 50% yes on this question. Clinton, Trump and Cruz polled above 50% no (Bush polled at 50% no), while Rubio and Kasich had more yes than no.
"Right kind of experience to be President": Clinton, Sanders and Bush polled above 50%, with Clinton and Bush over 60%. Trump and Rubio polled over 50% no, Cruz had more no than yes, and Kasich had more yes than no.
"Shares your values": Only Sanders even touched 50% yes on this question. Clinton, Trump and Cruz had 50% no (Bush was at 50% no), while Rubio and Kasich had more no than yes.
"Would have a good chance of defeating <other party> nominee": Clinton and Trump polled over 50% yes. Sanders polled more yes than no, while Bush, Rubio, Cruz and Kasich all polled at over 50% no.
Methodology:
http://www.quinnipiac.edu/images/polling/us/us02182016_demos_Urpfd42.pdf