The Senate Challenger With the Biggest Head Start

Ohio Treasurer Josh Mandel was the earliest top-tier challenger to announce a campaign, though some Republicans aren’t yet entirely sold on it and Democrats have been targeting him for weeks.

Ohio Treasurer Josh Mandel (right), with then-presidential candidate Marco Rubio, talks to workers during a stop at BOC Water Hydraulics in Salem, Ohio, in 2015.
AP Photo/Scott R. Galvin
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