Las Vegas (CNN) – Paul Ryan continued to go after President Barack Obama and defend Mitt Romney on Tuesday, but the Republican vice presidential candidate stayed away from the issue of Medicare that continues to dog the GOP campaign.

The Romney campaign stepped up its defense by responding to Democratic attacks on the issue with a television ad. Ryan was asked about the brewing debate in a Fox News interview, but otherwise steered clear at two public rallies, until he weighed in via Twitter.

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