Politics | William "Mo" Cowan Milestone: 2 Black Senators to Serve at Same Time Cowan's appointment makes some history By John Johnson Posted Jan 30, 2013 4:55 PM CST Copied William "Mo" Cowan, right, is only the eighth black senator in history. (AP Photo/Massachusetts Governor's Office, File) The pick of William "Mo" Cowan to fill John Kerry's Senate seat in Massachusetts results in a little American history being made, notes Bloomberg. For the first time ever, two black senators will serve at the same time. Cowan joins Tim Scott of South Carolina, who got picked to fill the recent Jim DeMint vacancy. Cowan isn't running in the June special election, which means Scott will again be the sole black senator at that point. But it's possible that both Scott and Cory Booker of New Jersey will be elected to full terms in 2014, notes Dave Weigel at Slate. Read These Next GOP Sen. Tillis suggests Pete Hegseth is 'out of his depth.' Los Angeles tunnel collapses with workers inside. He's an American hero—and an undocumented immigrant. Missing teen surfer found alive on uninhabited island. Report an error