Party affiliations morphing across the US.
A look at California.
https://www.google.com/amp/www.latimes.com/politics/la-pol-ca-on-politics-column-20180301-story.html%3foutputType=amp
Introductory excerpt:
For a party halfway in the grave, the news thudded like another shovelful of dirt β thwack! β heaved atop its coffin: The Republican Party may soon slip into third place among registered California voters, trailing Democrats and self-declared independents.
The decline of the GOP β now barely a quarter of the state's electorate β has been a precipitous one in this formerly deep-red redoubt, a decline all the more striking given the provenance of figures like Earl Warren, Richard Nixon and Ronald Reagan. Between them, they represented California on the national ticket in 8 out of 10 presidential races over a nearly 40-year span.
That said, the latest registration figures weren't that hot for Democrats, either. True, at 45%, the party enjoys a sizable advantage over Republicans. But that level of support has hardly budged in 20 years, even as the party tightened its vise grip on the state.
The significant growth in registration has come in the ranks of California voters who stated no party preference and now make up 25% of the electorate, nearly on a par with Republicans and almost certain to overtake the GOP before long. A little more than 20 years ago, self-described independents were just 12% of the state electorate.