Mitt Romney plans to stay on the attack in the race for the White House, but growing pressure from across the political spectrum to release his personal tax returns threatens to stunt the Republican's momentum as he courts voters in key battlegrounds.
The former Massachusetts governor takes his fight against President Barack Obama to Ohio today. He'll try to build off fiery speeches in Pennsylvania, where on Tuesday he accused his Democratic opponent of supporting a government-centered society.
Obama has a series of official meetings in Washington, but plans to launch a two-day Florida campaign swing later in the week.
Democrats have pressed for the release of more of Romney's tax returns. They were joined Tuesday by more high-profile conservatives, including Texas Gov. Rick Perry.