California Created Single-Party Elections. Now They're More Competitive (2015)

While reason.tv is Libertarian, the historical context of this change in voting has more to do with the Reform party (mentioned in passing in the video).

It had greatest success on the national stage with outsider candidates (Ross Perot and early Trump). Libertarians tend to prefer candidates who cannot act, rather than nonpartisans, so what’s interesting about this interview is that the Reform party disagrees —- it sees the California district elections heading toward coalition governance.