"It is incredible that such an act can take place in our country," Trump said.In fact, if only it were incredible.People who study political violence have been unnerved for a while. Now, this is a scene from the nightmare scenarios that have been playing in their heads.We've already seen congressman Steve Scalise, a Republican, survive a shooting. Gabrielle Giffords, a Democrat, survived a shooting. An intruder bludgeoned Nancy Pelosi's husband with a hammer in her home.Nearly one-quarter of U.S. presidents have survived assassination attempts or been killed.
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