U.S. first lady Michelle Obama poses for a photo during the Fall Harvest of the White House Garden, with students from Kimball Elementary School, on the South Lawn of the White House in Washington, October 29, 2009.
REUTERS/Larry Downing (UNITED STATES POLITICS)


First lady Michelle Obama high fives a student from Washington's Bancroft Elementary School as they harvest vegetables from the garden on the South Lawn of the White House in Washington, Thursday, Oct. 29, 2009.
(AP Photo/Alex Brandon)


First lady Michelle Obama, left, looks on as a girl from Washington's Bancroft Elementary School jumps as she uses tool to dig for sweet potatoes as they harvest vegetable garden on the South Lawn of the White House in Washington, Thursday, Oct. 29, 2009.
(AP Photo/Alex Brandon)


U.S. first lady Michelle Obama attends the Fall Harvest of the White House Garden with students from Bancroft Elementary School on the South Lawn of the White House in Washington, October 29, 2009.
REUTERS/Larry Downing (UNITED STATES POLITICS)


A girl from Washington's Bancroft Elementary School reacts as she sees the sweet potato being held by first lady Michelle Obama as they harvest vegetables from the garden on the South Lawn of the White House in Washington, Thursday, Oct. 29, 2009.
(AP Photo/Alex Brandon)


U.S. first lady Michelle Obama holds a sweet potato as she attends the Fall Harvest of the White House Garden with local elementary school students on the South Lawn of the White House in Washington, October 29, 2009.
REUTERS/Larry Downing (UNITED STATES POLITICS)


U.S. first lady Michelle Obama holds an earth worm as she attends the Fall Harvest of the White House Garden with local elementary school students on the South Lawn of the White House in Washington, October 29, 2009.
REUTERS/Larry Downing (UNITED STATES POLITICS)


U.S. first lady Michelle Obama attends the Fall Harvest of the White House Garden with students from Bancroft Elementary School on the South Lawn of the White House in Washington, October 29, 2009.
REUTERS/Larry Downing (UNITED STATES POLITICS)



First lady Michelle Obama walks with with children from Washington's Bancroft Elementary School after they harvested vegetables from the garden on the South Lawn of the White House in Washington, Thursday, Oct. 29, 2009.
(AP Photo/Alex Brandon)


First lady Michelle Obama helps students from Washington's Bancroft Elementary School as they push a wheel barrow with sweet potatoes they harvested from the garden on the South Lawn of the White House in Washington, Thursday, Oct. 29, 2009.
(AP Photo/Alex Brandon)


U.S. first lady Michelle Obama attends the Fall Harvest of the White House Garden with students from Bancroft Elementary School on the South Lawn of the White House in Washington, October 29, 2009.
REUTERS/Larry Downing (UNITED STATES POLITICS)


First lady Michelle Obama, left center, claps with children from Washington's Bancroft and Kimball Elementary Schools after their harvest of vegetables from the garden on the South Lawn of the White House in Washington, Thursday, Oct. 29, 2009.
(AP Photo/Alex Brandon)


First lady Michelle Obama, left center, smiles with children from Washington's Bancroft and Kimball Elementary Schools after their harvest of vegetables from the garden on the South Lawn of the White House in Washington, Thursday, Oct. 29, 2009.
(AP Photo/Alex Brandon)