More than four months after the shootings in Newtown, Conn. prompted President Obama to vow to do all he could to curb gun violence, his initiatives are still facing numerous hurdles. Colleen McCain Nelson explains. Click here to subscribe to our channel: / wsj Visit us on Facebook: / wsjlive Follow us on Twitter: / wsjlive Visit the Wall Street Journal: www.wsj.com Don’t miss a WSJ video, subscribe here: http://bit.ly/14Q81Xy More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ Video Center: https://wsj.com/video On Facebook: / videos On Twitter: / wsj On Snapchat: https://on.wsj.com/2ratjSM