U.S. Secretary of Agriculture Tom Vilsack answers questions from journalists during a press conference of the 20th China and U.S. Joint Commission on Commerce and Trade Thursday Oct. 29, 2009 in Hangzhou, China. AP Photo logo AP Photo 4 weeks ago

U.S. Secretary of Agriculture Tom Vilsack answers questions from journalists during a press conference of the 20th China and U.S. Joint Commission on Commerce and Trade Thursday Oct. 29, 2009 in Hangzhou, China.