The venues may have changed, and the planning and special events may have gotten splashier with younger VIPs, but for more than 40 years, there has been one constant at Democratic Party conventions: Bill Clinton.

The former president, who just turned 78, is scheduled to speak ahead of Gov. Tim Walz at Wednesday night’s gathering, marking his 13th time making remarks at the event.

Clinton’s address will be hopeful and aspirational, according to a source familiar with its contents.

The source also said it will include fiery, newsworthy jabs aimed at former President Donald Trump and will highlight the qualities that make for a responsible, qualified commander in chief in the nation’s highest office.

His speech is expected to highlight the striking differences in vision, experience and temperament between Harris and Trump, the source said, underscoring the vice president’s story and what her candidacy means for the nation.

Wednesday’s speech is his 13th

His timeline at the conventions showcased his rise through the party ranks to the top of the Democratic ticket and being enshrined as one of its most prominent historical figures.

After giving a brief speech at the 1976 convention, where he talked about the legacy of former President Harry Truman, Clinton was invited to speak at the 1980 convention when he was freshman governor of Arkansas.

The 33-year-old gave a brief speech, talking about his upbringing in Hope, Arkansas, and the dreams for his then 6-month-old daughter Chelsea.

Between that convention and the next, Clinton had lost one gubernatorial reelection and won another, earning the nickname “the comeback kid.” Speaking at the 1984 convention, representing the New Democrats movement, Clinton invoked Harry Truman in his pitch to the Democrats.

“He began the Democratic Party’s historic commitment to civil rights and brought the United States into peacetime cooperation with other nations,” he said.

Clinton was given a major speaking slot at the 1988 DNC with a primetime speech ahead of the nomination of Massachusetts Gov. Michael Dukakis.

The speech turned out to be memorable but in the wrong way. Clinton spoke for 35 minutes, much longer than his planned 15, boring the crowd.

In fact, one of the loudest responses came at the end when Clinton told the crowd, “In closing.”

He would get a different reception four years later at the DNC at New York’s Madison Square Garden when he accepted the party’s nomination for president.

‘The Man from Hope’

Before his speech, an autobiographical video was played titled “The Man from Hope,” a theme that Clinton emphasized in a 53-minute speech.

“I still believe in a place called Hope,” he told the roaring crowd.

During his speech at the 1996 DNC, Clinton flipped the message of his Republican opponent Sen. Bob Dole, who campaigned on the idea of being a bridge to the past.

“Let us resolve to build a bridge to the 21st century,” he said.

Clinton’s next appearance at the DNC came after rough four years at the White House. He became the second president to be impeached on perjury and obstruction of justice charges following an affair with White House intern Monica Lewinsky.

The Senate later acquitted him on those charges.

Clinton entered the Staples Arena during the 2000 DNC with a camera following his path to the podium while the arena’s screen displayed his administration’s successes such as the first budget surplus in decades and declines in crime.

“My fellow Americans, the future of our country is now in your hands,” he said. “And remember, whenever you think about me, keep putting people first.”

In 2004, Clinton told Democratic delegates that he came as a “foot soldier” to help elect Sen. John Kerry.

He reminded the nation that was in the midst of two wars in the Middle East following the Sept. 11 attacks of more peaceful times.

When Hillary Clinton ran against Barack Obama

In 2008, Clinton began the campaign season championing Sen. Hillary Clinton in her bid for the Democratic nominee, even taking jabs at her competitor then Sen. Barack Obama.

Clinton showed no animosity towards Obama during his speech at the 2008 DNC.

“Senator Obama’s life is a 21st century incarnation of the old-fashioned American dream. His achievements are proof of our continuing progress toward the more perfect union of our founders’ dreams,” he said.

Clinton would repeat this sentiment during his remarks four years later.

In 2016, Clinton took the DNC stage in another new role as the spouse of the Democratic presidential candidate. In his speech, he talked about their relationship and her resolve to help Americans.

“But for this time, Hillary is uniquely qualified to seize the opportunities and reduce the risks we face. And she is still the best darn change-maker I have ever known,” he said.

Like other speakers, Clinton’s appearance at the 2020 DNC was done virtually due to the COVID-19 pandemic. In just video message recorded from his Chappaqua, New York home, Clinton reassured voters that former Vice President Joe Biden was the best candidate to lead America back.

“It’s Trump’s “Us vs. Them” America against Joe Biden’s America, where we all live and work together. It’s a clear choice. And the future of our country is riding on it,” he said.

ABC News’ Gabriella Abdul-Hakim contributed to this report.