If he attacks Obama with as much vigor as he attacked his conservative primary opponents, he may have a shot at winning. This remains to be seen.
Romney’s style of vigorously attacking his primary opponents are unlikely to work against Obama for three reasons:
1 - How can Romney attack Obama with sincerity or conviction when Romney’s politics and policies as governor of Massachusetts are basis for Obama’s?
2 - Obama not only survived the Clinton slime machine, he turned Hollywood and the MSM against the Clinton’s.
3 - Romney is culturally tone-deaf.