Former Vice President Al Gore will be the keynote speaker at the Iowa Democratic Party’s Oct. 4 Jefferson-Jackson Dinner, party chair Scott Brennan announced Tuesday.

“We are deeply honored that former Vice President Al Gore, our nation’s leading voice on combating the global climate crisis and a Nobel Peace Prize winner, will be the keynote speaker at our Jefferson Jackson Dinner,” Brennan said in a party press release. “I join Governor Chet Culver and Senator Tom Harkin in expressing gratitude to former Vice President Gore for accepting the invitation to speak at what will be our biggest event of the year. We are excited to welcome him back to Iowa.”

The Jefferson-Jackson Dinner is traditionally the state party’s largest fundraising event. Last year, the six major presidential candidates all attended, along with House Speaker Nancy Pelosi and all the state’s top elected officials.