Gov. Brian Sandoval proposed expanding all-day kindergarten to nearly half of Nevada’s elementary schools, boosting programs for English language learners, and investing more in the Millennium Scholarship during his State of the State address Wednesday.Education dominated the speech and accounts for much of the additional spending Sandoval proposes in his two-year, $6.5 billion budget, which was released the same day. “Our greater challenge is helping a Nevada that is still on the horizon,” Sandoval said. “I want us to agree that what we find there must be the best it can be.”The Republican governor’s speech was largely optimistic even while …