To win the nomination, Rick Santorum needs 69 percent of the remaining delegates. Even a brokered convention may be elusive. After Louisiana on Saturday, the road ahead looks tough.
Rick Santorum needs to pull an upset in Illinois – an unlikely prospect given latest polls – and win in other winner-take-all primaries to push Mitt Romney to a brokered Republican Party convention.
With Newt Gingrich and Rick Santorum splitting the conservative vote, polls put Mitt Romney right in the thick of it in both Alabama and Mississippi.
Barring a major upset, Mitt Romney is still on track for the nomination. But Super Tuesday could have been a lot better for him, and the path ahead is daunting.
Complex rules for allocating convention delegates mean the winner of Tuesday's Michigan primary, probably Mitt Romney or Rick Santorum, is likely to share the spoils with the runners-up.