The President has no record to stand on, like typical incumbents. Therefore, he will spend most of his time attacking Republicans. That's the strategy:
President Obama in recent days has provided a taste of the sharp tone he will use in the general election against Mitt Romney, the presumptive GOP nominee.Full article
Obama has emerged this year with sharper elbows than the “no-drama" candidate had in 2008. He is injecting drama, cranking up the rhetoric, for example by chiding Romney and congressional Republicans as being "radical" and “members of the flat Earth society.”
Obama, as one former aide put it, "is putting the bully in bully pulpit."