In the past few days, Democrats have secured majority control of the Pennsylvania House and moved within one seat of ending Republican control of the New Hampshire House. Those wins are not aberrations. They are the latest measures of a nationwide blue wave that has seen Democrats outperform expectations in 24 of 30 special elections for open state legislative seats this year. Legislative contests that were once considered local or regional races are being nationalized, as concerns about abortion rights and voting rights—two issues that are up for grabs in statehouses—are putting Republican candidates in a perilous position. SNIP The...