A bill pending in the California Senate would guarantee healthcare for all under what's known as a single-payer model - people pay into a fund, and a state agency handles coverage from there. The idea will be the subject of two town hall meetings at the Sonora Opera Hall on Thursday, one at 12:30 p.m., the other at 6:30 p.m. "We really think that with the federal attacks on healthcare, California has an opportunity to lead and has another path," said Pilar Schiavo, one of the presenters and a Sonora-area native who is coordinating the campaign on behalf of the California Nurses Association.