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Charles Krauthammer weighed in on the House Democrat sit-in, which he described as a "successful PR stunt."

He said that the idea behind the stunt was not to pass legislation, but to appeal to voters on the gun control issue while it's popular.

"This is all about the elections. This is all about appealing on this issue."

Krauthammer said there's no simple answer to keeping guns out of the hands of terrorists.

"This is opportunism by Democrats who think - perhaps they're right - that the pendulum has swung on the gun issue."

Watch the full commentary above.

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