As Ryan attempts to dismantle Medicare as we know it, he is trying to distract attention from his plan by falsely claiming that Obama is the one who is cutting Medicare. People in Wisconsin have not fallen for Ryan's illusion, and I expect voters across America won't either.
Words ought to have consequences. If Obama can say something demonstrably true, and the media's principal response is to quote the other side as saying Y, it's going to be a long, unenlightening spring. And summer. And fall.