Melisa Goh

Since the early a.m., U.S. Park Police have been moving into a park near the White House where the Occupy D.C. movement has been encamped for months. Some officers are on horseback and dressed in riot gear, but there haven't been any major clashes so far.

The Democratic congresswoman from Arizona said she will step down this week in order to focus on her health. Giffords was shot in the head and wounded last January as she was meeting with constituents outside a supermarket in Tucson, Ariz.

In the year that's followed the shooting that left six dead and 13 wounded — including Rep. Gabrielle Giffords (D-Ariz.) — the nation has mourned with Tucson as the city has healed.