(Reuters) - It was one of the defining moments of the 2008 presidential campaign: A woman at a rally for Republican John McCain, while asking McCain a question, called Democratic contender Barack Obama "an Arab" who couldn't be trusted. McCain took the microphone and said, "No ma'am. He's a decent family man ... who I just happen to have disagreements with on fundamental issues." McCain's response symbolized his discomfort with the volatile crowds he was seeing as his campaign faded during the final days of the 2008 race. On Monday, at a factory in this Ohio community near Cleveland the crowd that greeted Mitt Romney wasn't angry, but the Republican presidential candidate faced a similar situation.