Andrew Sullivan has a helpful round up of the current debate about whether the GOP can attain electoral success in the face of increasing population diversity by “doubling down” on white voters. The experience of California suggests that such a strategy can help a political party in the short term, but only at the cost of crippling it in the long term.

Younger Americans are often surprised to learn that California was a Republican-friendly state for decades. Other than in the 1964 LBJ landslide win over Goldwater, Californians supported a Republican for President every cycle from 1952 through 1988. However, by the early 1990s, the increasing diversity of the state began to alter the political landscape, just as it is doing now nationally.

The debate within the California GOP at the time was eerily similar to that happening within the national Republican Party today. Virtually all Republican leaders conceded that the rise of Latino and Asian-American voters required some response, but what that response should be was the subject of intense disagreement.

California GOP reformers, noting that a Democratic Presidential Candidate (Bill Clinton) had broken the GOP lock on the state in 1992 with strong support from minority voters, argued that the party had to modernize by reaching out to people of color. A different faction, who pointed out that Clinton had captured only 46% of the popular vote and that Ross Perot had attracted many conservative white voters, insisted that the Republican party needed to go hard right, including by making race-based appeals to white voters.

The two GOP factions battled each other in the lead-up to the 1994 gubernatorial election and the “double-downers” won. Anti-immigrant ballot Proposition 187 was the central issue of the contest, and like any Californian I can attest to the venomous, racially-divisive nature of the debate that surrounded it. Republican Pete Wilson publicly embraced the measure at every campaign stop, and rode anti-immigrant sentiment to re-election with strong support from White voters.

In the process, Wilson and those who advised him to double-down on white voters did lasting damage to the California Republican Party from which it has never recovered. In the minds of much of the population of this minority-majority state, the GOP is the party of white people who don’t like non-white people, a branding that — fair or not — repulses most minority voters and no small number of white voters as well.

Subsequent Democratic Presidential candidates have not even bothered to campaign in California; why should they? They need only stop by to gather big campaign contributions that would have gone to Republicans in prior eras. Traditional Republicans are neutered in the state legislature and have no chance in the gubernatorial race either. The only Republican Governor since Wilson, Arnold Schwarzenegger, won by packaging himself as a post-partisan figure and following it through by rejecting many of the national GOP’s key positions.

The California lesson for the national GOP? Racially divisive appeals to alienated white voters can work, perhaps especially in a mid-term election. Indeed, doubling down on white voters may well work nationally in 2014. But pursuing such short-term electoral rewards is a route to long-term political oblivion in an increasingly diverse America.

[Cross-posted at The Reality-based Community]

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Keith Humphreys is a Professor of Psychiatry at Stanford University and served as Senior Policy Advisor in the White House Office of National Drug Control Policy in the Obama Administration. @KeithNHumphreys