President Obama with cadets after speaking about his Afghanistan policy at the U.S. Military Academy at West Point, N.Y. Julie Jacobson/AP hide caption

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(From left) Sen. Russell Feingold (D-WI), Rep. Barbara Lee (D-CA) and Rep. Jim McGovern (D-MA) take part in a news conference on Capitol Hill on Tuesday to discuss President Obama's decision to send more troops to Afghanistan. Pablo Martinez Monsivais/AP hide caption

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President Lyndon Johnson signs the Tonkin resolution, which gave him power to escalate the Vietnam war. It was easily passed by both houses of Congress, although it was later repealed. MPI/Getty Images hide caption

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