Analysis: CA's enrollment success is its greatest challenge

California is coming face to face with the reality of one of its biggest Obamacare successes: the explosion in Medi-Cal enrollment. The numbers — 2.2 million enrollees since January — surprised health care experts and created unforeseen challenges for state officials. Altogether, there are now about 11 million Medi-Cal beneficiaries, constituting nearly 30 percent of the state's population. That has pushed the public insurance program into the spotlight, after nearly 50 years as a quiet mainstay of the state's health care system, and it has raised concerns about California's ability to meet the increased demand for health care.