Fighting for survival in the Republican presidential race, Nikki Haley is casting rival Donald Trump and Democratic President Joe Biden as "Grumpy Old Men" who are way past their primes in a new strategic effort that looks to tap into voters' apathy toward a 2020 rematch. Haley's campaign said on Wednesday it was rolling out digital ads and mailers that would raise doubts about both Trump and Biden’s mental acuity, criticize them for not campaigning more vigorously and cast them as profligate spenders. Haley, who is 52 and a former ambassador to the United Nations,...