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    Deadly school shootings in the United States education system

    02:15
  • President Obama's responses to mass shootings

    04:14
  • Pres. Obama meets families of Ore. shooting victims

    04:49
  • Political protesters greet Obama in Oregon

    02:54
  • Carson: Obama politicized Oregon shooting

    02:03
  • Obama en route to Oregon

    03:44
  • Protesters expected during Obama's Oregon visit

    01:33
  • Chris Matthews on Carson’s 'crazy' politics

    01:30
  • DA: Officers not wearing body armor

    02:54
  • Obama's advice to gun control advocates

    06:43
  • Will Congress finally act on gun reform?

    06:41
  • Family of shooting victim speaks out

    11:37
  • Officials: Shooter's cause of death suicide

    01:51
  • Roseburg mayor: 'We're coming together'

    02:52
  • Years after Sandy Hook, what's changed?

    12:09
  • Obama on mass shootings: Politics have to change

    10:17
  • Bush response to Ore. tragedy sparks debate

    04:13
  • Rep. McCarthy reacts to Oregon shooting

    03:55
  • Obama slams Congress on gun control

    09:02
  • Oregon victims left unique marks on community

    04:26

45 school shootings in U.S. so far in 2015

04:49

Pia Carusone, executive director of the anti-gun violence group Americans For Responsible Solutions, joins Alex Witt to discuss the findings of a new report, which calculates that the U.S. mass shooting rate has tripled over the past three years.