This week, San Francisco wide receiver Anquan Boldin spelled out what every Niners fan has known:Since Game 1, when Boldin had 13 catches against the Packers, other teams have been trying to smother him, and much of the time he's seen double coverage.That was especially true when tight end Vernon Davis was out of the lineup with a hamstring injury, leaving Boldin as the only proven target for quarterback Colin Kaepernick."If he's not in there, I know I'm going to get doubled," Boldin told Scott Kegley of the team's website. "If you have a guy like him that can take the top of the defense, defenses tend to roll to him some, too. It kind of takes some of the pressure off of me, takes some of the double teams off. He's an added weapon for us."But what really takes the shackles off the 49ers' receivers is the Niners running game. When it's clicking, everything else falls into place.This past Thursday night in a 35-11 victory over the Rams in St. Louis, the 49ers' slumbering running game came alive, with the offensive line opening up big holes for Frank Gore, and Gore exploding for 153 yards on 20 carries.Suddenly, said Boldin, the Rams defense had to take a different approach. It's...