campus shooting in oregon. i would imagine we're going to hear that theme again today. >> reporter: that's right, martin. this is interesting to see bernie sanders really try to align himself a little bit more with the democratic base, in advance of next week's debate. hillary clinton on different issues is doing the same thing. so it was interesting last night in tucson to hear sanders really deviate from his stump speech and to vote a significant amount of time talking about his own evolution on gun control. this is one issue where hillary clinton actually runs to the left of him. he's much more moderate. in front of that crowd last night in tucson, he admitted the that he has been conservative on the issue, but talked about how he wants to sharpen, expand the background checks and really close gun show loopholes, specifically, he mentioned that. here's more of what he said last night in tucson. >> while, yes, there are disagreements of how we go forward, in terms of gun safety, i think the vast majority of the american people want us to move