By Maane Khatchatourian
July 20, 2012 at 04:22 PM EDT

This morning in Florida, President Barack Obama addressed the Colorado theater shooting that left 12 dead and dozens injured. Obama was scheduled to speak about his campaign, but instead paid tribute to the victims of the tragedy:

“[Even] as we learn how this happened and who’s responsible, we may never understand what leads anybody to terrorize their fellow human beings like this,” he said. “Such violence, such evil is senseless. It’s beyond reason. But while we will never know fully what causes somebody to take the life of another, we do know what makes life worth living.  The people we lost in Aurora loved and they were loved. They were mothers and fathers; they were husbands and wives; sisters and brothers; sons and daughters, friends and neighbors. They had hopes for the future and they had dreams that were not yet fulfilled.”

Vice President Joe Biden and First Lady Michelle Obama also canceled their speaking events today, campaign spokeswoman Jen Psaki told USA Today .

According to Psaki, affiliates in Colorado have been asked to take down “contrast ads.” The Mitt Romney campaign has also pulled advertising in Colorado, said Romney spokeswoman Andrea Saul. The GOP nominee will address the Colorado incident today at a previously scheduled campaign event.

In a statement released earlier today, Obama called the shooting “horrific and tragic.”

“We are committed to bringing whoever was responsible to justice, ensuring the safety of our people, and caring for those who have been wounded,” Obama said. “As we do when confronted by moments of darkness and challenge, we must now come together as one American family. All of us must have the people of Aurora in our thoughts and prayers as they confront the loss of family, friends, and neighbors, and we must stand together with them in the challenging hours and days to come.”

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