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California voters head to the polls Tuesday in one of the most expensive and closely watched primary elections in state history, with high-stakes races for governor and lieutenant governor set to determine who advances to November.

More than $5.7 million in independent spending has transformed California’s lieutenant governor race, boosting Michael Tubbs and intensifying the battle for a top-two finish ahead of the June primary.

A Opponents, including voting rights groups and Democratic organizations, argue that election administration is primarily the responsibility of states and Congress and contend that portions of the order exceed presidential authority. Supporters argue the reforms would improve voter roll accuracy, reduce the risk of duplicate registrations, and strengthen confidence in election outcomes.

The political shockwave that began in Louisiana with the defeat of Republican U.S. Sen. Bill Cassidy delivered an even larger aftershock Tuesday night in Texas. Four-term U.S. Sen. John Cornyn one of the most established Republicans in Washington and a former Senate GOP whip was decisively defeated by Texas Attorney General Ken Paxton in one of the biggest Senate primary upsets in modern Republican history.