President Obama did something at the White House today he has never done, but which thousands of others have:

Walk through a metal detector — which he set off.

After walking back across Pennsylvania Avenue from a holiday reception at the Blair House, Obama took a detour to the security checkpoint at the Northwest Gate and chatted with the security guards for a little bit.

After they explained how White House visitors clear security, Obama walked through a metal detector, which beeped apparently because of the presidential cellphone.

“I just wanted to see what it was like getting in here,” Obama said.

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