Transcript for Mitt Romney Struggles to Explain Paul Ryan's Plan
And now, we turn to the political debate in this country, it's your voice, your vote and it's been a week since governor romney brought new energy to the presidential ration baming congressman paul ryan as his running mate. But as abc's jake tapper tells us tonight, some top republicans are watching and worrying. Reporter: This was generally not seen by republican officials as a sign of a campaign on message. I want to bring as much clarity as possible. Reporter: Mitt romney with a white board, struggling to help people understand his position. So this is the president's plan. Reporter: And more important, the subject matter. The romney campaign now finds itself consumed by one topic. Plans by paul ryan. Medicare as an option? Mitt romney has his own plan. Reporter: Specifically, the plan proposed by romney's new running mate, paul ryan, to turn medicare into a voucher-like system for future retirees. Republican sources say the romney campaign did not expect this much attention on the topic, and its response has sometimes been confusing. One minute surrogates distancing the romney medicare plan from ryan's. But it's very different. Reporter: The next minute. Paul ryan and my plan for medicare, I think, is the same, if not eidentical. Reporter: Former republican congressional leader tom davis sings ryan's praises but says republican members of congress arworried. Generally, medicare debates advantage democrats. Independent analysts say the ryan plan could mean future retirees would have to pay more out of pocket. Democrats say ryan would send the program into a death spiral. It raises some issues you wouldn't have had with another nominee. Reporter: House republicans in areashigh senior populations in the south and in swing states, florida, ohio and pennsylvania, are especially worried. In a conference call with republican members of congress earlier this week, house speaker john boehner provided republicans with a game plan in this new environment, telling them to "stay on offense on jobs and the economy." There are some washington insiders and members who are nervous about how this plays out. Reporter: And republican leaders say romney should focus entirely on president obama's handling of the economy and the 8.3% unemployment rate, die yap.
This transcript has been automatically generated and may not be 100% accurate.