The Vikings play their 2nd of 4 preseason games at Baltimore against the Ravens tonight at 6:30, pregme on AM 1390-the Fan at 5:30.  The Vikings lost their first preseason game 34-17 last Friday at home against Seattle.  The starters are expected to play into the 2nd quarter and maybe the entire first half.  Starting running back Adrian Peterson played but didn't touch the ball in the preseason opener but is expected to see limited action tonight.  Tarvaris Jackson gets the start at quarterback for the Vikings with Gus Frerotte backing him up.  John David Booty will see some time at quarterback in the 2nd half and it's unclear how much if any time Brooks Bollinger will see at QB tonight.