WEST PALM BEACH, Fla. (MCT) — President Barack Obama broadened his attack on Mitt Romney on Thursday, using Medicare to draw a sharper contrast on key issues in this swing state.

With an eye on seniors, Obama warned that Romney would undermine their federal health care entitlement program. In a speech after the early-bird dinner at a retirement community, he linked the program’s fate to Romney’s position on taxes, building on his campaign’s assertion that Romney would “end Medicare as we know it to help pay for his tax cuts for the wealthiest.”