Those who don’t learn from history, become Democrats.
Here’s the truth about the Vietnam war. 
Many years after the Vietnam War, General Vo Nguyen Giap, the North Vietnamese military commander, wrote,”if it were not for the disunity created by…stateside protest, Hanoi would have ultimately surrendered.” Former North Vietnamese Colonel Bui Tin explained, “Through dissent and protest lost the ability to mobilize a will to win.” With the help of certain journalists who couldn’t tell the difference between victory and defeat on the battlefield, the communists prevailed. While antiwar activists were spitting in the face of our returning troops, the people of South Vietnam were being slaughtered by the thousands.
Militant Islamists understand recent American history, and they understand that the only way to defeat America is to turn her against herself. Although President Bush handily won reelection, the defeatists have decided to continue their apoplectic campaign. Formerly known as liberals or progressives, the defeatists apparently prefer the status quo of despotic power over the prospect of liberty.
Question [to NVA COL Bui Tin]: How did Hanoi intend to defeat the Americans?
Answer: By fighting a long war which would break their will to help South Vietnam. Ho Chi Minh said, We don’t need to win military victories, we only need to hit them until they give up and get out.”
Question: Was the American antiwar movement important to Hanoi’s victory?
Answer: It was essential to our strategy. Support of the war from our rear was completely secure while the American rear was vulnerable. Every day our leadership would listen to world news over the radio at 9 a.m. to follow the growth of the American antiwar movement. Visits to Hanoi by people like Jane Fonda, and former Attorney General Ramsey Clark and ministers gave us confidence that we should hold on in the face of battlefield reverses. We were elated when Jane Fonda, wearing a red Vietnamese dress, said at a press conference that she was ashamed of American actions in the war and that she would struggle along with us.
Question: What was the purpose of the 1968 Tet Offensive?
Answer: To relieve the pressure Gen. Westmoreland was putting on us in late 1966 and 1967 and to weaken American resolve during a presidential election year.
The bottom line is we won the battle field, but were defeated by anti American leftists.
The Col confirms this himself :
The conscience of America was part of its war-making capability, and we were turning that power in our favor. America lost because of its democracy; through dissent and protest it lost the ability to mobilize a will to win.
Now, can anyone tell me how the Democrats are helping our enemies in the Middle East, today?