[caption id="attachment_118540" align="alignleft" width="150"] The massacre at Sandy Hook Elementary School stands as a possible tipping point after a decade-long aversion to talking about stricter gun laws.[/caption]

The question surfaces each time a mass murder unfolds, especially at a school: Will this one change the political calculus in Washington, D.C., against tougher gun control?

The answer, after the Virginia Tech killings, the attempted assassination of Gabby Giffords, the Colorado movie-theater attack, the Wisconsin Sikh temple shootings, and more: No. But now?

The massacre at Sandy Hook Elementary School in Newtown, Conn., the bloodiest...

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