He is one of them after all.

Via The Hill:

Sen. John McCain — a Democrat?

There was confusion Wednesday after the Arizona Republican mistakenly strolled into President Obama’s meeting with Senate Democrats at the Capitol.

The room full of Democrats — who happened to be meeting in the same room where the Senate GOP usually holds their weekly policy luncheons — erupted in applause and laughter as the former Republican presidential candidate made his entrance.

As McCain, 76, walked out of the Dem-filled space, reporters pressed him as to why he stepped foot in the room.

Saying he “had to give a speech,” McCain was eyed walking away sporting a big grin.