A hot mic exchange between Vice President Joe Biden and Sen. John McCain today may leave some wondering just whose side each is on.

After Biden gave the oath of office to McCain, and the senator’s family approached for a photo, the two engaged in small talk.

“Thank God you’re here, John,” Biden told McCain. “I’m so glad you ran again.”

“Thank you, we love you,” McCain said in return.

Biden then moved in for a kiss and some close talk with Cindy McCain.

Watch: