Californians Set to Vote on Universal Pre-K Plan

Rob Reiner’s measure shows reduced support in recent opinion polls.

Supporters of California’s Proposition 82—the Preschool for All initiative—are turning to high-profile political and community leaders to help counter a backlash to the measure, which goes to the voters on June 6.

Proposition 82, sponsored by the actor and director Rob Reiner, would make all California 4-year-olds eligible for free preschool through an additional 1.7 percent income tax on individuals earning at least $400,000 a year and couples earning $800,000 or more a year.

Recent polls have shown the initiative continues to enjoy support among likely voters, though the gap between likely “yes” and “no” voters has closed dramatically in recent months as controversy involving Mr. Reiner and questions about the measure’s costs...