Independence Day picnic in Washington, D.C. (6 images)

US President Barack Obama, with First Lady Michelle Obama delivers remarks to an Independence Day picinic on the South Lawn of the White House in Washington, DC on July 4, 2012. On this Independence Day President Obama is hosting a 4th of July celebration picnic on the South Lawn for White House staff and US service members. UPI/Shawn Thew/Pool

US Secret Service agents stand on post as US President Barack Obama delivers remarks to an Independence Day picinic on the South Lawn of the White House in Washington, DC on July 4, 2012. On this Independence Day President Obama is hosting a 4th of July celebration picnic on the South Lawn for White House staff and US service members. UPI/Shawn Thew/Pool