Warren Buffett to give Hillary Clinton more billionaire star power

Democratic presidential candidate Hillary Clinton and Warren Buffett.
Noah Berger | Bloomberg | Getty Images

Billionaire investor Warren Buffett, who endorsed Hillary Clinton in December, is set to introduce the Democratic presidential nominee at an event in Omaha on Monday, according to Clinton campaign officials.

Following the introduction from the Berkshire Hathaway chairman and CEO, Clinton is expected to highlight in her remarks a new study of her economic policies from Moody's chief economist Mark Zandi, a registered Democrat and Clinton donor who also advised Sen. John McCain's 2008 GOP presidential campaign.

The Moody's analysis, dated last week, said: If all of Clinton's stated policies become law in the manner proposed, "real GDP would be 1.7 percent larger" by the end of her term, with 3.2 million more jobs.

In June, Moody's released a highly critical report on the economic policies of Republican presidential nominee Donald Trump. The analysis said: If all of the real estate mogul's policies were adopted, the economy would suffer a "lengthy recession," with 3.5 million fewer jobs.

In addition to the favorable Moody's report, the Clinton campaign also got a boost over the weekend from billionaire Mark Cuban, who's been constantly blasting Trump on social media.

The "Shark Tank" host and owner of the Dallas Mavericks, officially endorsed Clinton at a Saturday rally in Pittsburgh, Cuban's hometown in the key battleground state of Pennsylvania.

Disclosure: CNBC owns the exclusive off-network cable rights to "Shark Tank," which features Mark Cuban as a judge.