Donald Trump has such an overwhelming lead over his Republican rivals in tomorrow's Alabama primary that there is a possibility the businessman will sweep the state's 29 at-large delegates, according to a Monmouth University poll released Monday. Trump may also pick up the remaining 21 district-wide delegates, although chances are much lower of that scenario occurring, according to the survey.

With 42 percent support in Alabama, Trump holds a large lead over his rivals - none of whom meet the 20 percent threshold needed to be awarded at-large delegates. Florida Sen. Marco Rubio is in second with 19 percent support, followed by Texas Sen. Ted Cruz at 16 percent, retired neurosurgeon Dr. Ben Carson at 11 percent and Ohio Gov. John Kasich at 5 percent.

If Trump gets 50 percent support in tomorrow's primary, he'll pick up the 29 at-large delegates and 21 district-wide delegates, even if his rivals surpass the 20 percent threshold.

Monmouth estimated that the Republican frontrunner may pick up anywhere between 60 percent to 85 percent of Alabama's 50 delegates on Tuesday.

"There is an outside chance that only Trump ends up meeting the delegate threshold in Alabama," said Patrick Murray, director of the Monmouth University Polling Institute, in a statement. "But even if Rubio and Cruz qualify, [it] looks like Trump could easily rack up the vast majority delegates awarded..."

Trump has a huge advantage with Alabama's evangelical voters, who make up 77 percent of likely Alabama Republican primary voters. He's earning 43 percent support among evangelicals, with Rubio at 18 percent and Cruz at 15 percent.

In the Democratic primary, former Secretary of State Hillary Clinton has a large lead over independent Vermont Sen. Bernie Sanders, 71 percent to 23 percent. That includes a commanding lead among black voters - 80 percent to 12 percent - and a 59 percent to 37 percent margin among white voters against Sanders.

The Monmouth poll was conducted via telephone between Feb. 25 and Feb. 28. It consisted of 450 likely Alabama Republican primary voters and 300 likely Alabama Democratic primary voters. The margin of error was plus-or-minus 4.6 percentage points in the Republican survey and plus-or-minus 5.7 percentage points in the Democratic survey.