New York Senator and Democratic presidential hopeful Hillary Clinton speaks to supporters during a campaign stop in Mishawaka, Indiana March 28, 2008. (Xinhua/Reuters Photo)

If Hillary Rodham Clinton is feeling heat from pundits and party elders to quit the race and back Barack Obama, you'd never know it from her crowds, energy level and upbeat demeanor on the campaign trail.

"There are millions of reasons to continue this race: people in Pennsylvania, Indiana and North Carolina, and all of the contests yet to come," Clinton told reporters Friday, "This is a very close race and clearly I believe strongly that everyone should have their voices heard and their votes counted."

The former first lady weathered a two-pronged blow Friday, with influential Pennsylvania Sen. Bob Casey Jr. endorsing Obama and another Senate colleague, Vermont Democrat Patrick Leahy, urging her to step aside. But to hear Clinton tell it, it was just another day in an epic primary battle whose result is still not known.