As President Barack Obama prepares to convene a health-care summit at the White House later this week, Administration officials are signaling that he intends to pursue a very different strategy for getting reform passed from the one used by his Democratic predecessor in office. Unlike the failed effort of 1994, when Bill and Hillary Clinton presented Congress with a detailed blueprint for reform and never saw a bill reach the floor of either the House or Senate Obama is outlining broad principles, with a bottom line of universal coverage, and leaving it up to lawmakers to fashion a plan for meeting them.