DENVER — The newly shaped Republican presidential ticket is fighting growing pains amid charges from President Barack Obama's re-election team that challenger Mitt Romney favors his new running mate's controversial plans to overhaul Medicare and cut trillions of dollars from social programs.

The debate moves across five swing states as both campaigns operate at full strength for a second day.

Romney will spend Tuesday in Ohio on the final day of his multistate bus tour, having dispatched his vice presidential pick, Wisconsin Rep. Paul Ryan, to court voters and donors in Colorado and Nevada. For all the advantages of having a running mate to share the workload, the Republicans are working through the challenge of planning double the events, coordinating messaging on the road, handling new security stresses and simply getting to know each other.