President Obama promises to use power to help stop more tragedies

WASHINGTON, D.C. - Two days after the senseless murder of 20 innocent elementary school children and six adults, President Obama tried to start the healing process during a prayer vigil Sunday night in Newtown, Conn.

More than 900 mourners packed Newtown High School yesterday and heard an emotional President Obama admit the country has failed them.

Obama said he'll use the power of the presidency to stop tragedies like the massacre of 26 children and adults at Sandy Hook elementary school.

“If there is even one step we can take to save another child, or another parent, or another town, from the grief that has visited Tucson, and Aurora, and Oak Creek, and Newtown, and communities from Columbine to Blacksburg before that -- then surely we have an obligation to try."

Monday morning, new clues about the killer, 20-year-old Adam Lanza, are emerging.

Computers and videos were removed from the Lanza family home this weekend that could provide clues into his motive.