The AIPverse, I guess?
1969-1973: Richard Nixon / Spiro Agnew * (Republican)
def. 1968 Hubert Humphrey / Edmund Muskie (Democratic), George Wallace / Curtis LeMay (American Independent)
def. 1972 George Wallace / Orville Hubbard (American Independent), Henry Jackson / Shirley Chisholm (Democratic)
1973: Richard Nixon / VACANT (Republican)
1973-1975: Richard Nixon ** / Leslie Arends (Republican)
1975-1977: Leslie Arends / VACANT (Republican)
1977-1983: George Wallace * / Frank Rizzo (American Independent)
def. 1976 Leslie Arends / Howard Baker (Republican), Vance Hartke / Hugh Carey (Democratic), Mark Gravel / Lewis McCammon (Peace), Jose Angel Gurierrez / Salvadore Carpio Jr. (La Raza Unida)
def. 1980 John Connally / Chuck Percy (Republican), Jerry Brown / Philip Hart (Democratic), Xenaro Ayala / Ramsey Muniz (La Raza Unida)
1983-1984: Frank Rizzo / VACANT (American Independent)
1984: Frank Rizzo / Eldon Rudd * (American Independent)
1984: Frank Rizzo / VACANT (American Independent)
1984-1985: Frank Rizzo / VACANT (Independent)
1985-1993: Bob Dole / Richard Schweiker (Republican)
def. 1984 Gordon J. Humphrey / Margaret Heckler (American Independent), Frank Rizzo / various (Independent), Oscar "Zeta" Acosta / Peter Diamondstone (Democratic-La Raza Unida)
def. 1988 Pat Robertson / Marge Roukema (American Independent), Hector Perez Garcia / Mike Freeman (Democratic-La Raza Unida), Raul Ruiz / David McReynolds ("Liberal Democratic-La Raza Unida")
1993-1997: Malcolm Lucas / John Warner (Republican)
def. 1992 Jake Garn / Danny Lee Burton (American Independent), Jerry Brown /Eileen Anderson (Democratic-La Raza Unida)
1997-2001: Wayne LaPierre / Newt Gingrich (American Independent)
def. 1996 Malcolm Lucas / John Warner (Republican), Saul N. Ramirez / Charlene Jarvis (Popular Front)
2001-2009: Norman Schwarzkopf / Bill Richardson (Republican)
def. 2000 Wayne LaPierre / Tommy Armstrong (American Independent), H. Pua Ishibashi Jr. / Helen Hernandez (Popular Front), Bob Smith / Rudy Giuliani (write-in)
def. 2004 Dan Quayle / Hal Rogers (American Independent), Kathleen Brown / Michael Brown (Popular Front)
2009-2013: Bill Richardson / Deval Patrick (Republican)
def. 2008 Wayne LaPierre / Duncan Hunter (American Independent), Rocky Anderson / Lisa Bender (Popular Front)
2013-2017: Elliott Abrams / Piyush Jindal (Right to Life)
def. 2012 Bill Richardson / Deval Patrick (Republican), Matt Salmon / Andy McKenzie (American Independent), Beto O'Rourke / Martin Porchas (Arriba Aztlan!), Terri Bonoff / P. Michael Sturla (Popular Front)
2017-xxxx: Brian Schweitzer / Tim Ryan (Republican)
def. 2016 Elliot Abrams / Piyush Jindal (Right to Life), Andy McKenzie / Howard Mills III (American Independent), Al Green / Bob Hasegawa (Popular Front)
def. 2020 Becky Gerritson / Corey Stewart (Right to Life), Ben Stiller / Howie Morales (Popular Front) Nicholas Sarwark / Walker Stapleton (American Independent)
* - Resigned
** - Assassinated
This started out as something of a fairly standard AIPverse. Then I added in a more lasting La Raza Unida. Several hours of work later, this is what we have. I posted a WIP earlier in this thread.
Basically, the Democrats go into a decline while the AIP grows. The Republicans stagnate, but ultimately recover. In the midst of the Ethiopian War, Wallace chooses Pennsylvania Governor Frank Rizzo in 1976 to placate the moderate wing of the party. In 1980, Jerry Brown chooses former Senator Philip Hart. This is the last hurrah of the Democrats. Wallace resigns for health reasons, Rizzo takes office. Rizzo is Opposed by the right wing of the AIP and then prrimaried. He loses nomination and runs independent. Acosta disappears 1987. The AIP increasingly dysfunctional throughout 1990s and 2000s, but manages to win 1996. President LaPierre oversees a war in South Africa, where Norman Schwarzkopf gains fame. LaPierre is blamed for the worst parts of the war, while Schwarzkopf is hailed as a hero for his armored drive across the veldt on Johannesburg. Schwarkopf's term is relatively popular, and his Vice President runs and wins in 2008. Renomination of LaPierre and his subsequent loss leads to accusations that the party was not fully behind him. The Republicans nominate primary runnerup Patrick to a unity ticket. The grassroots conservatives are emboldened by the 2010 economic crash, and bolt from the AIP after the Congressional delegation votes in favor of one of Richardson's spending bills. The new Right to Life Party wins in a reaction to the "failed" Richardson administration, however the Republicans retake the White House in 2016. Their opposition is divided and the Republicans firmly control the center to center-right.
Other notes: Helen Hernandez ran for CA-30 in the 1992 Democratic primaries. Michael Brown is the DC Shadow Senator.