Under President Obama's healthcare law, cancer patient Kathy Watson and nearly 62,000 other "uninsurable" patients are getting coverage through a little-known program for people who have been turned away by insurance companies because of pre-existing medical conditions, the Pre-Existing Condition Insurance Plan, known as PCIP. Watson's case illustrates the potential impact of tying everything in the far-reaching legislation to the fate of one provision, the unprecedented requirement that most Americans carry health insurance. State officials who administer the federal pre-existing condition plan in 27 states are trying to make fallback arrangements in case the law is invalidated and coverage suddenly terminates.