WASHINGTON (AP) Republicans trying to repeal and replace former President Barack Obama's health care law are grappling with a hard lesson that vexed him: Quality health insurance isn't cheap, especially if it protects people in poor health, older adults not yet eligible for Medicare, and the poor. Something has to give. Now, the GOP's laser focus on lowering premiums could undermine comprehensive coverage, such as the current guarantees that people with medical problems can get health or that...