The Obama administration will grant extra time to Americans who say they are unable to enroll in health care plans through the federal insurance marketplace by the March 31 deadline, in a decision that swiftly drew Republican ridicule. All consumers who have begun to apply for coverage on HealthCare.gov, but who do not finish by Monday, will now have until about mid-April to ask for an extension. "We are experiencing a surge in demand and are making sure that we will be ready to help consumers who may be in line by the deadline to complete enrollment -- either online...