Senator Murphy said that the states that keep "those dangerous weapons like AR-15s out of the hands of civilians" have much lower rates of gun violence. Even the left-wing media had to admit that his claim was false.

Via the Hartford Courant:

“What we know is that states that have tougher gun laws, that keep criminals from getting guns, that keep those dangerous weapons like AR-15s out of the hands of civilians, have dramatically lower rates of gun violence."

-- Sen. Chris Murphy, D-Conn., during an appearance on CNN's “State of the Union,” Oct. 8, 2017

During an appearance on CNN's "State of the Union" on Oct. 8, Sen. Chris Murphy, D-Conn., asserted that tough gun laws do work, pointing generally to low rates of gun violence in states with tough laws.

But what are the facts on his claim? Let's take a look.