"But, but, but......."
Technically speaking, Congress has not OFFICIALLY "declared war" since WWII. Korea, Vietnam, Persian Gulf, and the Terrorism campaign are all undeclared wars. The Civil War was an undeclared war, too. Here's what a resolution for a declared war looks like:
December 8, 1941
JOINT RESOLUTION Declaring that a state of war exists between the Imperial Government of Japan and the Government and the people of the United States and making provisions to prosecute the same.
Whereas the Imperial Government of Japan has committed unprovoked acts of war against the Government and the people of the United States of America: Therefore be it Resolved by the Senate and House of Representatives of the United States of America in Congress assembled, That the state of war between the United States and the Imperial Government of Japan which has thus been thrust upon the United States is hereby formally declared; and the President is hereby authorized and directed to employ the entire naval and military forces of the United States and the resources of the Government to carry on war against the Imperial Government of Japan; and, to bring the conflict to a successful termination, all of the resources of the country are hereby pledged by the Congress of the United States.
Approved, U.S. House of Represenatives, 388-1
Approved, U.S. Senate, 82-0
Hereby authorized by President Franklin D. Roosevelt, December 8, 1941, 4:10 p.m. E.S.T.
The ONLY times in U.S. history that war has been officially "declared" are the following:
November 4, 1812: Joint Resolution declaring a state of war has existed between the United States and the Kingdom of Great Britain since November 2, 1812.
May 11, 1846: Joint Resolution declaring a state of war has existed between the United States and the Republic of Mexico since April 24, 1846.
April 25, 1898: Joint resolution declaring a state of war has existed between the United States and the Republic of Spain since April 21, 1898
April 2, 1917: Joint resolution declaring a state of war has existed between the United States and the Republic of Germany since April 2, 1917
December 8, 1941: Joint resolution declaring a state of war has existed between the United States and the Empire of Japan since December 7, 1941
December 11, 1941: Joint resolution declaring a state of war has existed between the United States and the Government of Germany since December 8, 1941
December 11, 1941: Joint resolution declaring a state of war has existed between the United States and the Government of Italy since December 8, 1941
Each of those were passed following a joint session of congress where the President asked them to declare war. I fully support President Bush's War on Terrorism, but if he wants to go by the books, he must ask congress to declare a state of war has existed between the U.S. and Iran, Iraq, and North Korea since September 11th.