[djr]

fold. On the power of your straight alone you only have 8 outs, that's 5:1 against hitting the turn (2.5:1 to hit by the river) and 4:1 pot odds. Now consider that if a spade hits you're in trouble and someone may already have a J hi straight (in which case the 6's are worthless). There's no garautee that if you call it won't get capped by MP2 and have the turn jammed as well. You haven't put much money in yet, get out now.