The president of the United States is a highly regarded position and one that should not be abused by anyone for personal agendas.
Mr. Obama on more than one occasion has demonstrated racist style remarks/comments in regards to the Zimmerman trial, a white police officer and others.
George Zimmerman stood trial in a United States court of law. He was found not guilty, and released.
Mr. Obama has no right to speak on gun rights issues while addressing this case since Mr. Zimmerman was found to be within the law.
Furthermore this event should reflect how positive the outcome of allowing citizens to defend themselves with the use of deadly force is, and why it's important that the rights of Americans are not infringed upon.