Pres Obama & PM Cameron walk to Marine One on their sports night out. (TV Pool photo by Adam Aigner-Treworgy/CNN)

Pres Obama greeted by "elves" at Christmas at Washington taping. (Pool photo by Mike Majchrowitz/Fox News)

It's time to play: Whose flag is flying over Blair House today?

Marine One comes in for a landing on WH South Lawn returning Pres Obama from Joint Base Andrews.

Pres Obama returns salute of US Marine as he steps off Marine One back at WH from 3-day western trip.

Pres. Obama's motorcade gets stuck in traffic on the way to Tonight Show taping in Burbank.

Marine One passes Washington Monument after liftoff from WH South Lawn.

And it's time to play: Can you name the flag flying over Blair House today?

Also tomorrow: CBS marks the 60th anniversary of its logo: the CBS eye. Don't blink.

Marine One dials back its anti-grav devices & gently sets down on South Lawn returning Pres Oam from bus trip.

Pres Obama returns salute from US Marine as he arrives back at the WH. His pumpkins being driven back.

Presidential bus drives by F-18 Hornet on tarmac at Joint Base Langley-Eustis today in Hampton, VA.

Pres Obama pulls cartload of pumpkins he purchased at Virginia Farm Market.

Wearing safety glasses, Pres Obama watches demonstration by HS robotics team in Skipwith, VA.

Like a kid in a candy store, Pres Obama selects from barrels of candy at Mast General Store in NC today.

Pres Obama chats about economy & jobs with lunch crowd at BBQ place in NC today.

Looks like BBQ place was cutting back on employees hiring this guy as greeter. (Pool Photo by Scott Horsley/NPR)

Marine One comes in for landing on WH South Lawn to pick up Pres Obama for flight to Joint Base Andrews.

Pres Obama returns salute from US Marine as he boards Marine One to embark on 3 day bus tour thru NC & VA.

Dressed casually, as if for a 3-day bus trip, Pres Obama departs WH to board Marine One, sort of a flying bus.