In addition, the Rankings of the candidates have been updated. Barbour's departure from the race will have negligible impact: Elephant Watcher calculated his odds of winning the nomination at 0%. However, Rick Santorum and Ron Paul--each of whom were ranked lower than Barbour and also have a 0% chance of victory--will advance a rank in Barbour's absence.
Barbour stated that he lacked the "fire in the belly" needed to make the run. His inability to generate enthusiasm or attract support likely played a role in his decision as well.