Mercury News–

Voters choosing no party affiliation have overtaken Republicans in Democrat-dominated California, marking a troubling slide for the GOP in the nation’s most populous state that a generation ago was home to the Reagan Revolution.

Political Data Inc., which compiles figures from county election offices, reported this week that 4.84 million of California’s 19 million voters declared no party preference while 4.77 million registered Republican at the close of registration for the June 5 primary. Democratic party registration was 8.44 million and voters registering with other parties totaled just under 1 million.

“The fact is, no party preference has been growing as a share for the electorate for the past many years,” said Political Data Vice President Paul Mitchell.

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