Chart from the Abulsme.com 2012 Republican Delegate Count Graphs page. When a candidate gets down to 0%, they have cinched the nomination. If they get up past 100%, they have been mathematically eliminated.
Romney picks up another superdelegate. This of course slightly improves his sitaution and slightly degrades everybody else’s.
Currently Romney needs 49.9% of the remaining delegates to win. His closest competition, Gingrich, needs 53.5% of the remaining delegates to be able to catch up and win. Santorum needs 53.7%. And finally Paul is furthest behind of the candidates still in the race, needing 54.3% of the remaining delegates to catch up and win.