Ohio voters are at the polls Tuesday to choose a Republican challenger to incumbent Democratic Sen. Sherrod Brown. The competitive Senate seat in a red state is considered a must-win for Republicans who hope to regain control of the chamber in November. The race will also serve as an early measure of how much Donald Trump's MAGA seal of approval is worth in a year when Trump once again tops the Republican ticket. Once a three-man race, by Tuesday the contest was down to two leading candidates: State Sen. Matt Dolan, who was endorsed by Ohio's popular Republican governor, Mike DeWine. Businessman Bernie Moreno is a strong contender, boosted by an endorsement form Donald Trump. Ohio, a largely white working-class state that has historically held purple-state status, has reddened over t