GOP looks for Senate campaign reset heading toward November

Republicans are looking to hit the reset button on their Senate midterm election playbook after weeks of poor polls and stories about Democratic momentum.

Senate GOP candidates emerged from primaries battered, bruised and struggling to gain traction in their general election matchups. Even GOP leaders in the upper chamber began expressing reservations about “candidate quality” and the party’s ability to win a majority.

But they now appear to be recalibrating — moving around funds, shifting messaging and sounding notes of optimism about their chances of picking up seats nearly two...