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Colorado State Rep. Tom Sullivan stands in support as he listens to former New York City mayor Mike Bloomberg as he speaks during a community forum on gun violence on Thursday, Dec. 5, 2019. Bloomberg is running for president in 2020 and was endorsed by Sullivan, whose son Alex was killed during 2012's Aurora theater shooting.

Former New York City mayor Mike Bloomberg speaks as Colorado State Rep. Tom Sullivan stands with his head bowed during a community forum on gun violence on Thursday, Dec. 5, 2019. Bloomberg is running for president in 2020 and was endorsed by Sullivan, whose son Alex was killed during 2012's Aurora theater shooting.

Malayjah Thomas wears a button of remembering her uncle Darrell Mitchell, who was shot and killed in Aug. at age 19, as she listens, while former New York City mayor Mike Bloomberg and Colorado State Rep. Tom Sullivan speak during a community forum on gun violence on Thursday, Dec. 5, 2019. Bloomberg is running for president in 2020 and was endorsed by Sullivan, whose son Alex was killed during 2012's Aurora theater shooting.

Malayjah Thomas wears a necklace remembering her uncle Darrell Mitchell, who was shot and killed in Aug. at age 19, as she listens, while former New York City mayor Mike Bloomberg and Colorado State Rep. Tom Sullivan speak during a community forum on gun violence on Thursday, Dec. 5, 2019. Bloomberg is running for president in 2020 and was endorsed by Sullivan, whose son Alex was killed during 2012's Aurora theater shooting.

Former New York City Mayor Mike Bloomberg (left) is introduced by Colorado State Rep. Tom Sullivan during a community forum on gun violence on Thursday, Dec. 5, 2019. Bloomberg is running for president in 2020 and was endorsed by Sullivan, whose son Alex was killed during 2012's Aurora theater shooting.

Tom Mauser, father of Columbine victim Daniel Mauser, as a question to former New York City mayor Mike Bloomberg and Colorado State Rep. Tom Sullivan as they speak during a community forum on gun violence on Thursday, Dec. 5, 2019. Bloomberg is running for president in 2020 and was endorsed by Sullivan, whose son Alex was killed during 2012's Aurora theater shooting.

Tom Mauser, wears the shoes of his son and Columbine victim, Daniel Mauser, while listening to former New York City mayor Mike Bloomberg and Colorado State Rep. Tom Sullivan speak during a community forum on gun violence on Thursday, Dec. 5, 2019. Bloomberg is running for president in 2020 and was endorsed by Sullivan, whose son Alex was killed during 2012's Aurora theater shooting.

Former New York City mayor Mike Bloomberg speaks as Colorado state Rep. Tom Sullivan stands in support during a community forum on gun violence on Dec. 5, 2019. Bloomberg is running for president in 2020 and was endorsed by Sullivan, whose son Alex was killed during 2012's Aurora theater shooting.

A pair of employees move the podium reading "END GUN VIOLENCE" as former New York City mayor Mike Bloomberg and Colorado State Rep. Tom Sullivan speak during a community forum on gun violence on Thursday, Dec. 5, 2019. Bloomberg is running for president in 2020 and was endorsed by Sullivan, whose son Alex was killed during 2012's Aurora theater shooting.

A podium reading "END GUN VIOLENCE" stands to the side as former New York City mayor Mike Bloomberg and Colorado State Rep. Tom Sullivan speak during a community forum on gun violence on Thursday, Dec. 5, 2019. Bloomberg is running for president in 2020 and was endorsed by Sullivan, whose son Alex was killed during 2012's Aurora theater shooting.