"It's hard being a member of the mean party," says Bob Borochoff, a lifelong Republican who was on Capitol Hill this week asking legislators to support bills that will benefit disabled people like his son, Bradley, and returning veterans suffering from mental illness. There's no shortage of horror stories when it comes to health insurance, but Borochoff's tale on behalf of his son took him on a political journey, as well, and his disillusionment is emblematic of the uphill climb the Republicans face in November. Borochoff's tidy life as a restauranteur and happily married father of three, including newborn twins,...