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.