The Senate might not have any African-American members after the election, when Sen. Roland Burris (D-Ill.), the only sitting black senator, vacates his seat.

Overall, the Senate has never had more than one black member at a time. Burris replaced President Obama in this distinction after filling his Illinois seat following the 2008 election. Before Obama, Carol Moseley Braun, also from Illinois, served from 1993 to 1999.

In total, there have been six black senators since Reconstruction.

The 2010 field has lacked competitive African-American Senate candidates from the start. One exception, Rep. Kendrick Meek (D) in Florida, has consistently polled behind opponents Marco RubioMarco Antonio RubioChina's TikTok turns to former lawmakers to help with content moderation policies Hillicon Valley: Warren turns up heat in battle with Facebook | Instagram unveils new data privacy feature | Advocacy group seeks funding to write about Big Tech TikTok adds former lawmakers to help develop content moderation policies MORE (R) and Gov. Charlie Crist (I) and is not expected to win on Tuesday.

Meanwhile Burris's seat in Illinois will go to either Republican Rep. Mark KirkMark Steven Kirk10 top Republicans who continue to deny the undeniable GOP senator says he doesn't remember signing 2016 letter urging 'reform' of Ukraine prosecutor's office The 13 Republicans needed to pass gun-control legislation MORE or Democrat Alexi Giannoulias. Kirk led the polls by 4 points as of Oct. 31.