WASHINGTON – Medicare is the one health insurance plan that will cover virtually every American at some point in life, and Republican Mitt Romney is proposing the biggest changes since its creation nearly 50 years ago.

With important details still hazy, The Associated Press asked the Romney campaign questions about how his Medicare plan would affect consumers on critical matters of costs and benefits.

Some of the questions remained unresolved after the campaign’s responses. It may take electing Romney to find out how his plan would work.