FILE - In this Aug. 8, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns in Des Moines, Iowa. Democrats are growing increasingly confid

 

              FILE - In this Aug. 8, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns in Des Moines, Iowa. Democrats are growing increasingly confid
FILE - In this Aug. 8, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns in Des Moines, Iowa. Democrats are growing increasingly confident that a two-pronged tax attack on Republican Mitt Romney _ one part policy, one part politics _ could help President Barack Obama lure pivotal support from middle class voters _ and win a second term. Led by Obama, the Democrats are going after Romney for seeking to protect tax cuts for the wealthy and refusing to release more information on the taxes he pays on his multi-million dollar personal fortune. (AP Photo/Charles Dharapak, File)