Joe Biden joked that his marriage wouldn't have happened if he hadn't proposed to his now-wife Dr. Jill Biden five times.

During his remarks at the International Association of Fire Fighters 51st Convention in Philadelphia on Wednesday, the vice president joked about how "nothing" has happened to him by acclamation, when a motion is passed with no debate. Unfortunately for Biden, that includes his marriage:

"Nothing in my life has ever happened by acclamation. Nothing. As a matter of fact, I had to ask my wife five times to marry me before she said yes. So I don't know about this acclamation stuff."

It's not the first time Biden has made an awkward joke during a speaking engagement. He recently cracked a sex joke while delivering remarks at the National Council of La Raza.

But Biden did discuss more serious issues while speaking to the fire fighters, including the recent theater shooting in Aurora, Colorado. He touched on the incident to illustrate the value of first responders.

"They're alive, those 58 people, because of you. You arrived on the scene in a timely way, you got them the immediate help," Biden said.

"Look, I think I know you guys," Biden finished. "We owe you. Every now and then, it's worthy and worth it just to remind people."

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  • Dolley Madison

    Dolley Madison, wife of President James Madison, was the first First Lady to formally associate herself with a cause, <a href="http://www.firstladies.org/biographies/firstladies.aspx?biography=4" target="_hplink">according to Firstladies.org</a>. Madison helped found an orphanage for young girls in Washington, D.C., and maintained a lifelong connection to the organization.

  • Harriet Lane

    Although she was the niece of bachelor President James Buchanan and not his wife, Harriet Lane was nevertheless considered the First Lady of the Buchanan White House, <a href="http://www.firstladies.org/biographies/firstladies.aspx?biography=16" target="_hplink">according to Firstladies.org.</a> But, similar to other benevolent wives of our presidents, Harriet committed herself to two underserved populations that needed help -- Native Americans and children.

  • Ellen Axson Wilson

    Ellen Axson Wilson, the first wife of Woodrow Wilson, died young, but made a big impact during her short life, <a href="http://www.firstladies.org/biographies/firstladies.aspx?biography=28" target="_hplink">according to Firstladies.org</a>. She joined a campaign to get rid of the slums in the Washington, D.C. area, and advocated for improved housing and child labor laws.

  • Florence Harding

    When President Warren Harding was first elected to the U.S. Senate, his wife began advocating for the rights of returning World War I veterans. <a href="http://www.firstladies.org/biographies/firstladies.aspx?biography=30" target="_hplink">According to Firstladies.org</a>, Florence Harding launched the "Lest We Forget" Week to encourage donations of books and clothing to returning soldiers. She was also known to pick up wounded veterans on the street who needed a ride.

  • Grace Coolidge

    First Lady Grace Coolidge, the wife of President Calvin Coolidge, had always been interested in education -- especially for the deaf. During her husband's presidency, Grace became a trustee for the Clarke School for the Deaf, and was also involved with the American Red Cross during World War I, <a href="http://www.firstladies.org/biographies/firstladies.aspx?biography=31" target="_hplink">according to Firstladies.org</a>.

  • Lou Henry Hoover

    Before becoming First Lady, Lou Henry Hoover worked as an organizer for the American Red Cross' Canteen Escort Service, which transported wounded soldiers home during World War I. Her support for the troops was honored by King Albert I of Belgium, <a href="http://www.firstladies.org/biographies/firstladies.aspx?biography=32" target="_hplink">according to Firstladies.org</a>.

  • Eleanor Roosevelt

    During World War II, Eleanor Roosevelt supported the troops by volunteering with the American Red Cross, where she handed out cups of coffee, newspapers, sandwiches, candy, and cigarettes to soldiers heading out to army camps and ports, according to the <a href="http://www.redcross.org/museum/history/eleanorR.asp" target="_hplink">American Red Cross.</a> "I loved it," the organization quoted her having said. "I simply ate it up."

  • Barbara Bush

    After her son Neil was diagnosed with dyslexia at a young age, First Lady Barbara Bush began championing the cause when she founded the <a href="http://www.barbarabushfoundation.com/site/c.jhLSK2PALmF/b.4344531/k.BD31/Home.htm" target="_hplink">Barbara Bush Foundation for Family Literacy</a>, according to <a href="http://www.firstladies.org/biographies/firstladies.aspx?biography=42" target="_hplink">Firstladies.org</a>.

  • Hillary Clinton

    While serving as First Lady, now Secretary of State Hillary Rodham Clinton led the effort on the Foster Care Independence Bill, which helped older unadopted kids transition successfully into adulthood, <a href="http://www.firstladies.org/biographies/firstladies.aspx?biography=43" target="_hplink">according to Firstladies.org</a>.

  • Michelle Obama

    Still enjoying her role as First Lady to President Barack Obama, Michelle Obama has been vocal about three issues during her husband's administration: Helping working mothers, providing support to military families, and encouraging voluntarism, <a href="http://www.firstladies.org/biographies/firstladies.aspx?biography=45" target="_hplink">according to firstladies.org</a>.