Rep. Van Hollen greets Sen. Portman: ” Mr. President.”

This morning Rep. Chris Van Hollen (D-MD) and Sen. Rob Portman (R-OH) both appeared on the Starting Point set at the CNN Grill in Tampa for separate interviews with CNN Anchor John Berman.

Van Hollen walked up to Portman, shook his hand and said, “Mr. President.”

Van Hollen is playing Rep. Paul Ryan (R-WI) during debate prep with Vice President Joe Biden, while Portman is playing President Obama at debate prep with Mitt Romney.

VIDEO (Rep. Chris Van Hollen interview): http://on.cnn.com/NWFf5k

VIDEO (Sen. Rob Portman interview): http://on.cnn.com/NWFpd0

Starting Point airs weekday mornings from 7-9am ET on CNN.