Trump is up 8 points nationally since mid-November in the PPP survey.
A new poll finds Clinton with a 33-point lead.
The poll puts Rubio in first place among Republicans "very likely" to vote in the primary.
Trump gets 33 percent support among the state's Republicans, doubling the nearest contender.
A new poll shows Clinton with 55 percent support to Sanders's 33 percent.
The two GOP candidates are locked in a virtual tie in the state, a new poll finds.
It's the second national poll in as many weeks to have Carson in the top spot.
Bobby Jindal scored 6 percent support in the survey from Public Policy Polling.
Webb has been floating the possibility of running as an independent.
The Monmouth University poll differs wildly from others showing a tighter contest.