A Senate majority next year was once thought to be a pipe dream for Democrats that required them to run the table in deep-red terrain while defending several battlegrounds already controlled by their party.By the early hours of Wednesday morning, any Democratic trepidation dissipated as they racked up win after win and secured commanding control of the Senate. Iowa was the state that delivered the 51st seat, shortly before midnight, as the Democrats rode a blue tsunami that saw them pick up GOP-held seats in North Carolina, Texas, Kansas, and South Carolina in an electoral drubbing that will be felt...