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...