10 Things You Need To Know For Tuesday

He spoke for a nation in sorrow, but the slaughter of all those little boys and girls turned the commander in chief into another parent in grief, searching for answers. Alone on a spare stage after the worst day of his tenure, President Barack Obama declared Sunday he will use "whatever power" he has to prevent shootings like the Connecticut school massacre. "What choice do we have?" Obama said at an evening vigil in the shattered community of Newtown, Conn. "Are we really prepared to say that we're powerless in the face of such carnage, that the politics are too hard? Are we prepared to say that such violence visited on our children year after year after year is somehow the price of our freedom?"

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News in Photos: The 10 topics you should be ready to talk about today.