Washington (AP) - President Barack Obama's plan to remake the nation's health care system is about to take its biggest step yet toward becoming reality.

The pivotal Senate Finance Committee was poised to approve sweeping legislation Tuesday requiring nearly all Americans to purchase insurance and ushering in a host of other changes to the nation's $2.5 trillion medical system.

Much work would lie ahead before a bill could arrive on Obama's desk, but action by the Finance Committee would mark a significant advance, capping numerous delays as Chairman Max Baucus, D-Mont., held marathon negotiating sessions -- ultimately unsuccessful -- aimed at producing a bipartisan bill...