Another victory in hand but still badly trailing rival Mitt Romney, Republican presidential hopeful Rick Santorum vowed to continue his campaign despite an increasingly steep climb to the nomination. Santorum, buoyed by Saturday’s win in Louisiana’s primary that boosted his spirit but did not narrow the delegate gap, urged his supporters to stick with him even as much of the GOP establishment has coalesced around Romney’s increasingly inevitable coronation. Even in the face of the political headwinds, the former Pennsylvania senator seemed unwilling to acknowledge it would take a dramatic change in momentum to deny Romney his turn as the GOP nominee.