Washington (CNN) - Two top vice presidential contenders will campaign for Mitt Romney in battleground states, two Republican sources said.
Sen. Rob Portman of Ohio will go to Colorado on Wednesday, appearing as President Barack Obama arrives in the state for a two-day campaign swing. The Portman event is part of the Romney campaign "bracketing" strategy to counter Obama's message on trips.
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Former Minnesota Gov. Tim Pawlenty will campaign in Michigan on Wednesday and Thursday. Pawlenty will also go to New Hampshire Saturday for a state Republican Party event.