Former Massachusetts Gov. Mitt Romney has turned to proposals that could alter the way hundreds of millions of Americans get their medical insurance. The centerpiece of Romney's plan would overhaul the way most Americans get their health coverage: at work. He would do so by giving Americans a tax break to buy their own health plans. That would give consumers more choices, but also more risk. Romney's plan follows a lead set by President George W. Bush, who unsuccessfully pushed for a healthcare overhaul. It adopts proposals long championed by conservative healthcare experts.