Former Arizona Rep. Gabby Giffords talks during a vigil remembering the 25th anniversary of the Columbine High School mass shooting, April 19, in Denver. Giffords was severely wounded in a 2011 mass shooting outside a grocery store.
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Political violence shakes America as election looms
Long before a would-be assassin wounded former President Donald Trump, the fuse of political violence had been burning across America.
