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Republican presidential front-runner Donald Trump will likely finish with right around the 1,237 delegates necessary to secure the GOP nomination, Larry Sabato said on "America's Newsroom" today.

Reaching that magic number is vital for Trump, because if he does not get 1,237 delegates, he will not be the nominee, Sabato said, explaining that Trump will lose support on every successive ballot at a contested Republican National Convention.

Sabato said that means the next several weeks of primaries will be of key importance, starting tomorrow in Wisconsin.

42 delegates are up for grabs in Wisconsin, and current Badger State front-runner Ted Cruz figures to win a majority of them, if not all, Sabato said.

To get to 1,237 delegates, Trump will likely need to get approximately 55 percent of the remaining delegates, making every single one important.

After Wisconsin, 95 delegates are in the mix in New York's April 19 primary, followed by five more northeast states, including Pennsylvania, on April 26.

By May, a clearer picture of the primary race should emerge, Sabato said. He added that after that, the next big date is June 7, when voters in several other significant states, such as New Jersey and California, will cast their ballots.

Get more analysis from Sabato above, and see former New Hampshire Gov. John Sununu explain how the RNC rules are decided below.

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