90-yard run gives 49ers some breathing room

Just as the Chargers were creeping back into the game, 49ers quarterback Colin Kaepernick delivered a potential knockout blow. Late in the third quarter and just inside the San Francisco 10, Kaepernick exploded for a 90-yard touchdown run to re-establish the home team’s 14-point lead, 35-21.  The effort came on a pass play, with Kaepernick…