Sgt. Rafael Peralta’s case for the Medal of Honor has shifted again, according to a congressman who has pressed the Pentagon to review new evidence that he says shows the Marine chose to smother a grenade to save his buddies in Iraq. Peralta, 25, died Nov. 15, 2004, in Fallujah. He was awarded the Navy Cross in 2008 for disregarding his own personal safety while already mortally wounded, pulling the grenade to his body, “absorbing the brunt of the blast and shielding fellow Marines only feet away,” according to his award citation. Despite the extraordinary heroism, then-Defense Secretary Robert Gates…