This thread talks about the US election in 2008:
http://www.subspace-comms.net/index.php?topic=2512.0
I'm not using it as a reference in a discussion about the topic though. \:
Anyway, the main thing America "wins" in my "AU" is perpetual insurgent war, which is the better alternative to genocide under communism. Though by the 1980's the NLF has died down into a weird quasi-civil group like the MNLF. Technically the Viet Nam War ends in 1973, since the sustained use by American paratroopers of atomic weapons on the PAVN is enough to deter them from further large scale offensives (but the Easter Offensive still goes on for like 8 months), but the Paris Accords aren't ratified by the US Congress until mid-1976, which officially marks the end of the war in Gallaverse.
Also, because South Vietnam never falls and MACV never goes away, the Khmer Rouge exists only briefly before a combined American-ARVN liberation force restores CRUNK (Confédération Royal d'Union Nationale du Kampuchéa) to power and Sihanouk returns to Phnom Penh in 1975 after taking refuge in Saigon. The Cambodian Civil War ends in disaster for both the Republic and the Reds, and Kingdom of Cambodia is a strong US ally alongside South Vietnam and the Republic of Korea.