Voters will decide in June whether they want to tax California's richest residents to send the state's 4-year-olds to preschool. Secretary of State Bruce McPherson has certified the "Preschool for All'' initiative, declaring that its backers, led by actor-director Rob Reiner, had collected more than the 598,105 valid signatures needed to place the measure on the June 6 ballot. The voluntary program would offer a full year of preschool to all California 4-year-olds, provided mostly by local school districts. The initiative would boost the top tax rate by 1.7 percent on individuals earning more than $400,000 annually or married couples...