With Santorum taking the lead in Romney’s native state of Michigan, RCP looks at the path to a brokered convention, the most recent of which was the 1952 Democratic Convention.

While a brokered convention could be messy, it would certainly make for some great television and would likely ensure the highest ratings ever for a political convention.

Edit: We’ve just updated the PD Composite to include today’s Rasmussen poll, where Santorum leads Romney by 12 points as well today’s conflicting Gallup Poll tracking poll where Romney leads Santorum by 2 points.