National poll: Trump 49, Rubio 16, Cruz 15

On the Republican side, the new survey finds Trump’s lead is dominant, and his support tops that of his four remaining opponents combined. The businessman tops his nearest competitor by more than 30 points: 49% back Trump, 16% Marco Rubio, 15% Ted Cruz, 10% Ben Carson and 6% John Kasich.

Trump’s supporters are incredibly enthusiastic about the coming election, and largely committed in their support for him. Nearly 8 in 10 say that they are more enthusiastic about voting this year than in previous elections, among Republicans who are not supporting Trump, just 39% say they are more enthusiastic than in years past. Likewise, 78% of Trump’s backers say they will definitely support him vs. 22% who say they could still change their minds. Among those backing other candidates, 57% say they are committed to their chosen candidate.

The survey asked those Republicans not currently backing Trump whether they would support him if he became the party’s nominee, and just a quarter of Republicans overall say they probably or definitely wouldn’t support him in November. That’s about the same as the share saying they wouldn’t back Rubio or Cruz.