Saw this article in the Washington Post today. Fact checking Marco Rubio's statement. Interesting.
https://www.washingtonpost.com/news/fact-checker/wp/2015/12/10/marco-rubios-claim-that-no-recent-mass-shootings-would-have-been-prevented-by-gun-laws/?hpid=hp_hp-more-top-stories_factchecker_noon%3Ahomepage%2Fstory
https://www.washingtonpost.com/news/fact-checker/wp/2015/12/10/marco-rubios-claim-that-no-recent-mass-shootings-would-have-been-prevented-by-gun-laws/?hpid=hp_hp-more-top-stories_factchecker_noon%3Ahomepage%2Fstory