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Has Trump finally gone off the rails?

Personal attacks are one thing; baselessly comparing an opponent (who is almost universally popular with your own base!) to a child molester is jaw-dropping.

Republican presidential candidate Donald Trump speaks to guests during a campaign stop at Iowa Central Community College on Nov. 12, 2015 in Fort Dodge, Iowa. (Photo by Scott Olson/Getty)
Republican presidential candidate Donald Trump speaks to guests during a campaign stop at Iowa Central Community College on Nov. 12, 2015 in Fort Dodge, Iowa.Getty Images

Chuck Todd

Chuck Todd is NBC News' chief political analyst and the former moderator of "Meet The Press."

Mark Murray