In recasting the national health care law as a tax, Republican Mitt Romney risks straying from what had been his main focus: the limp economy under President Barack Obama. "Handling the economy" has been one subject on which the former businessman and Massachusetts governor has held a clear advantage in polls over President Barack Obama. But that edge may be eroding under the Obama campaign's withering attacks on Romney's activities at private-equity firm Bain Capital, including ads casting him as an "outsourcing pioneer." Plagued by dismal national economic statistics, the president embarked Thursday on a bus tour of battleground states Ohio and Pennsylvania, a Rust Belt trip with built-in economic overtones/Associated Press. More here. (AP photo)

Question: Why are major candidates having a difficult time deciding whether Obamacare is a tax, a penalty, or a fee?