LAS VEGAS -- Hillary Rodham Clinton summoned the nation to consider "hard truths" in the wake of Thursday's massacre at a church in Charleston, S.C., and pledged to "take action" in response to yet another mass shooting.

"In order to make sense of it, we have to be honest," said Clinton, the Democratic presidential front-runner. "We have to face hard truths about race, violence, guns and division."

In remarks here at the annual convention of the National Association of Latino Elected and Appointed Officials, Clinton offered words of solace and solidarity to the people of Charleston, where she was campaigning on Thursday just hours before the shooting.

"Today we say to the families of Mother Emmanuel and to all the people of Charleston, you do not walk alone," Clinton said. "You do not walk alone because millions of Americans regardless of race or creed or ethnicity or religion are walking with you -- in grief, in solidarity, in determination, we are with you. And we will stand with you as we seek answers and take action."

Clinton added, "How many innocent people in our country -- from little children, church members, to movie theater attendees -- how many people do we need to see cut down before we act? So as we mourn and as our hearts break a little more, and as we send this message of solidarity that we will not forsake those who have been victimized by gun violence, this time we have to find answers together."

Clinton described feeling optimistic about Charleston after her campaign stop Thursday, only to learn about the "horrific massacre" once she landed in Las Vegas that night.

"The shock and pain of this crime of hate strikes deep," she said. "Nine people – women and men – cut down at prayer, murdered in a house of God. It just broke my heart."