Where is the line?

The shot: Paul Ryan says he hasn't heard Donald Trump's exact remarks, but he thinks they were a "joke gone bad," and that you should "never joke about something like that":

The chaser: despite his belief that Donald Trump is joking about the assassination of Hillary Clinton, he won't rescind his endorsement:

"Textbook racism" doesn't do it, assassination humor doesn't do it. If there is a line, it must be drawn with invisible ink.

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