A petition posted on the White House website asks the president to award the nation’s highest award for valor to two fallen Marines who in 2008 stopped a truck laden with explosives from barreling through the checkpoint they were guarding in Iraq,saving dozens of lives. But those who want to sign on must act quickly. The deadline is Sunday. Cpl. Jonathan Yale, a rifleman with 2nd Battalion, 8th Marines, and Lance Cpl. Jordan Haerter, another rifleman with 1st Battalion, 9th Marines, were awarded the Navy Cross posthumously in February 2009. But the petition asks President Obama to upgrade the awards…