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The worst mass shooting in modern American history

We're starting to get a better sense of what transpired in Las Vegas overnight, in what appears to be the worst mass shooting in modern American history.

Image: Reported Shooting At Mandalay Bay In Las Vegas
LAS VEGAS, NV – OCTOBER 01 People run from the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas,…Getty Images

Steve Benen is a producer for "The Rachel Maddow Show," the editor of MaddowBlog and an MS NOW political contributor. He's also the bestselling author of "Ministry of Truth: Democracy, Reality, and the Republicans' War on the Recent Past."