You guys forgot more about this story than I know.
I have forgotten quite a bit in the last 40 years, some intentionally, some not.
I understand a NV general said in his memoirs that they lost lost during the Tet holiday. He also said that Walter Cronkite proped them up. I don't know his name so I am not sure what to search. I heard this on talk radio recently.
Though an opinion piece, the following might be usable with a cite, or can be used to find the original sources: Tet Offensive of 1968 - A Simpler Version
The Wall Street Journal published an interview with Bui Tin who served on the General Staff of the North Vietnam Army and received the unconditional surrender of South Vietnam on April 30, 1975. During the interview Mr. Tin was asked if the American antiwar movement was important to Hanoi's victory. Mr. Tin responded "It was essential to our strategy", referring to the war being fought on two fronts, the Vietnam battlefield and back home in America through the antiwar movement on college campuses and in the city streets. He further stated the North Vietnamese leadership listened to the American evening news broadcasts "to follow the growth of the American antiwar movement." Visits to Hanoi made by persons such as Jane Fonda, former Attorney General Ramsey Clark and various church ministers "gave us confidence that we should hold on in the face of battlefield reverses." Mr. Tin surmised, "America lost because of its democracy; through dissent and protest it lost the ability to mobilize a will to win." Mr. Tin further advised that General Vo Nguyen Giap (Commanding General of the North Vietnam Army) had advised him the 1968 Tet Offensive had been a defeat.
The military defeat of North Vietnam after the Tet Offensive of 1968 became a political victory for North Vietnam because of anti-war demonstrations and the sensationalism of the news media. The North Vietnamese interpreted the U.S. reaction to these events as the weakening of America's resolve to win the war. The North Vietnamese believed that victory could be theirs, if they stayed their course.
From 1969 until the end of the war, over 20,000 American soldiers lost their lives in a war that the United States did not have the resolve to win. The sensationalism by the American news media and the anti-war protests following the 1968 Tet Offensive gave hope to Communist North Vietnam, strengthening their belief that their will to succeed was greater than ours. Instead of seeking a successful resolution at the Paris Peace Conference following the disastrous defeat of the 1968 Tet Offensive, they employed delay tactics as another tool to inflame U.S. politics. This delaying tactic spurned further anti-war demonstrations. Those who sensationalized their reporting of the war and those who supported anti-war demonstrations are guilty of giving our enemy hope. Because of their actions, they must share partial responsibility for those 20,000 + Americans deaths.
We won the war on the battlefield but lost it back home on the college campuses and in the city streets.
In that sense, yes, there's a valid comparison between the Vietnam War and the Southwest Asian campaign in Iraq/ Mespotamia. But there are others of more interest at a macro level that are more analagous to the Vietnam War period of 1965-30 April 1975 and that of the Desert Shield/Storm/Sabre/Operation Granby period than are VN- First Persian Gulf War comparisons.