Who's running and who could run 2016?

Published: Nov 08 2012 11:41:49 AM EST   Updated On: May 04 2015 11:52:12 AM EDT

Ben Carson announced on May 4 he will seek the Republican nomination for president. Check out other formally announced or potential 2016 candidates.

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Retired physician Ben Carson announced his candidacy for president of the United States on May 4.

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Slideshow Of The Day

  • David Letterman

    Larry Busacca/Getty Images

    Notable TV exits through the years

    David Letterman will retire from the "Late Show" on May 20. Take a look at other high-profile personalities and their exits from particular shows or TV altogether.

On this Day

  • Alan Shepard, Project Mercury, Freedom 7 capsule

    NASA

    On this day: May 5

    Napoleon dies in exile, Mexico wins a historic battle, the first Three Stooges short premieres, and Alan Shepard becomes the first American in space, all on this day.