A gun in every holster
In what is probably the most important Second Amendment decision in U.S. history, the Supreme Court ruled 5 to 4 that the right to bear arms is a right of the individual, not a collective right regulated by the state.
The decision does not automatically undo any gun laws, except for the near total ban on handguns in Washington, DC that was at the heart of the case. However, expect lawsuits.
From a cultural standpoint, this could change the nature of politics in rural American where, as Barack Obama delicately put it, people are known to cling to guns and religion as markers of who they are and what they believe.