Donald Trump. REUTERS/Marvin Gentry Real-estate magnate Donald Trump held his biggest lead yet in a CNN poll of Republican primary voters that was released Monday, a day ahead of the Super Tuesday presidential primaries and caucuses that Trump looks set to dominate.

Trump had support from 49% of Republican and Republican-leaning voters nationally, according to the poll. That put him more than 30 points ahead of Sen. Marco Rubio of Florida, who was at 16%, and Sen. Ted Cruz of Texas, who was at 15%. Retired neurosurgeon Ben Carson had 10% support in the poll, while Gov. John Kasich of Ohio rounded out the Republican field at 6%.

Trump's number in the poll was up 8 points from last month, before the first caucuses and primaries of the election season. Rubio also saw an 8-point jump, while Cruz fell 4 points in the survey.

The CNN survey provided Trump with a better standing than other recent polls. According to the RealClearPolitics average of recent national surveys, Trump has about a 16-point lead.

Trump's rivals are scrambling to prevent him from running away with the Republican presidential nominations after his dominating victories in three of the first four voting states. Trump has strung off consecutive victories in New Hampshire, South Carolina, and Nevada ahead of Super Tuesday's contests, in which more than 10 states vote.

Polls over the past week have shown Trump with wide leads in many of those states. He also has received new momentum from the high-profile endorsements of Gov. Chris Christie of New Jersey and Sen. Jeff Sessions of Alabama.

The CNN poll found that Trump's supporters were highly enthusiastic about the election season and largely committed to voting for him. Almost 80% of Trump supporters said they were more excited about voting this year than in past elections. And almost the same eight in 10 said they would definitely support him, compared with 57% for other candidates.

The poll was conducted February 24-27, so it included two days of sampling both before and after last week's tense Republican presidential debate.