Bill Clinton praised Biden for his work on a number of issues, but expressed thanks for his sacrifice in stepping aside.

"And then he did something that's really hard for a politician to do: he voluntarily gave up political power," he said.

1:49

Bill Clinton compares Biden to George Washington

Bill Clinton praised Biden for his work on a number of issues, but expressed thanks for his sacrifice in stepping aside.

"And George Washington knew that and he did it, and he set the standard for us serving two terms before it was mandatory. It helped his legacy and it will enhance Joe Biden's legacy."

"It's a stark contrast to what goes on in the other party," Clinton said.

"After the last two days, aren't you proud to be a Democrat?" he asked the crowd as he began his remarks.

"I'm very grateful to the Republicans and independents that have joined us and I hope they feel better about it now," he said.

He also said he thought his wife, Hillary, gave a "great speech too." Clinton spoke on Monday about how she believed Harris could break the "hardest glass ceiling."

House Minority Leader Hakeem Jeffries got a huge laugh when took a jab at former President Donald Trump, calling him "an old boyfriend who you broke up with, but he just won’t go away."

"He has spent the last four years spinning the block, trying to get back into a relationship with the American people. Bro, we broke up with you for a reason," he said to cheers.

1:25

Jeffries labels Trump as 'old boyfriend you broke up with'

House Minority Leader Hakeem Jeffries got a huge laugh when took a jab at former President Donald Trump, calling him "an old boyfriend who you broke up with, but he just won’t go away."

Former President Bill Clinton scrapped a version of his speech after the watching the first night of the convention, several people familiar with the speech told ABC News.

Clinton, who is speaking Wednesday night, revised his speech to make sure the "substance meets the moment" and wanted to strike a more "joyful" tone, after he was struck by the energy of the convention floor, one source said.

A senior adviser to Clinton told ABC News that "it was clear to him that, in the spirit of Mario Coumo, we needed more poetry, not prose."

Cuomo gave the keynote address at the 1984 Democratic convention, saying, "We Democrats must unite so that the entire nation can unite, because surely the Republicans won't bring this country together."

-ABC News' Rachel Scott and Katherine Faulders