FILE - In this Oct. 3, 2012, file photo, then-Republican presidential candidate Mitt Romney speaks during the first presidential debate with President Barack Obama at the University of Denver, in Denver. Republican presidential candidates seem to be drawing this lesson from Mitt Romney’s failed 2012 campaign, don’t promise to balance the budget while cutting taxes. Romney’s vow led Democrats to accuse him of planning to effectively raise middle class taxes while dramatically cutting those for the wealthy. (AP Photo/Eric Gay, File)