Obama remarks on the ruling:

http://www.usatoday.com/videos/news/2013/07/19/2569761/

About gun laws in the US:

http://www.newyorker.com/talk/comment/2013/07/29/130729taco_talk_cobb

About race and the case:

http://seattletimes.com/html/opinion/2021450549_dionnecolumnracebooker23xml.html

http://www.slate.com/articles/news_and_politics/frame_game/2013/07/trayvon_martin_verdict_racism_hate_crimes_prosecution_and_other_overreactions.html

This is an ongoing conversation in the US; many more opinions and thoughts exist. Take a look around!