Washington — The November ballot in Texas is now set, after a four-term incumbent Republican senator lost to a Trump-endorsed challenger in Tuesday's primary runoffs. Meanwhile, Texas Democrats are angling to win their first Senate race since 1988.The Senate race was just one storyline on Tuesday night, as many downballot primary races highlighted larger themes seen throughout the country for both Democrats and Republicans. Here are some of the top takeaways from Tuesday's election:Power of Trump's endorsement Republican Sen. John Cornyn fell to Texas Attorney General Ken Paxton in a GOP primary runoff, losing the Senate seat he has held for 24...