Is it because you didn't think there were liberals calling for gun control after that incident and now that you've found out that they did, you need to change your question to get to what you actually meant?
There was a march the summer after that incident outside the NRA headquarters in Fairfax, VA.
https://www.theguardian.com/us-news/2017/jul/14/nra-headquarters-protest-sandy-hook-womens-march
What question would you like to ask now?