Retrieved January 24, 2021. Twelve vice presidents, including Biden, never broke a tie; Biden was the longest-serving vice president to never do so.

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^ Dowd, Maureen (August 1, 2015). "Joe Biden in 2016: What Would Beau Do?". The New York Times. Archived from the original on January 6, 2021. Retrieved January 24, 2021.

^ Zeleny, Jeff; Liptak, Kevin (August 1, 2015). "Joe Biden Keeps Watchful Eye on 2016 Race". CNN. Archived from the original on February 2, 2016. Retrieved August 2, 2015.

^ "Joe Biden still undecided on presidential run". BBC News. September 11, 2015. Archived from the original on January 3, 2021. Retrieved January 24, 2021.

^ Mason, Jeff (October 21, 2015). "Biden says he will not seek 2016 Democratic nomination". aol.com. Archived from the original on October 22, 2015. Retrieved October 21, 2015.

^ Reilly, Mollie (October 21, 2015). "Joe Biden Is Not Running For President In 2016". Huff Post. Archived from the original on April 5, 2019. 