Here's a short story:

(CNN) -- When Barack Obama was elected U.S. president he probably did not realize it would give him a chance to pick up tips on his backswing from the world's elite golfers. 

U.S. President Barack Obama and Vice President Joe Biden make use of the White House putting green. 

Obama is the honorary chairman for the 2009 Presidents Cup which will be contested at Harding Park Golf Course in San Francisco this week where the top U.S. golfers take on the best players from around the world outside of Europe. 

As a golf enthusiast, and keen amateur player, the president will get the chance to pick the brains of Tiger Woods, Phil Mickelson, Ernie Els and Vijay Singh on how to improve his game. 

But he is not the first to take to the greens while occupying the Oval Office with 15 of the last 18 U.S. presidents said to have played the sport while in power. Living Golf's gallery of presidential putters. » 

Dwight Eisenhower is recognized as probably the most dedicated to the sport, and was often criticized by Democrats for spending too much time on the golf course. 

Eisenhower's solution? In 1954 he had a putting green installed at the White House a short stroll from the Oval Office to enable him to practice while at work which was regularly used by subsequent presidents and still exists to this day. 

The former five-star general was also a member at the Augusta National Golf Club where a overhanging tree on the 17th hole proved such an obstacle to the leader that it was dubbed the "Eisenhower Tree."  (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: What does Obama and Biden use at the White House?
Guess: putting green

Question: What is he doing this week?
Guess: Obama is the honorary chairman for the 2009 Presidents Cup

Question: Where is it?
Guess: San Francisco

Question: Which course?
Guess: Harding Park Golf Course

Question: While there what will he have a chance to do?
Guess: improve his game

Question: Who can help him?
Guess: Tiger Woods

Question: Is he the first to play?
Guess: No

Question: How many have enjoyed the game?
Guess: 15 of the last 18 U.S. presidents

Question: Who was the most enthusiastic?
Guess: Dwight Eisenhower

Question: What was he criticized for?
Guess: spending too much time on the golf course

Question: By whom?
Guess: Democrats

Now answer the following question in the same format.

Question: What did he do?

putting green installed at the White House