Quote Originally Posted by Renton
Call when facing a raise while in position, it underreps your hand and you can fully use your position. If you reraise from position, you are effectively out of position during the hand because they'll always check to you and that doesn't tell you anything about their hand or their intentions.

Reraise from the blinds to get more money in while you most probably have the best hand, and increase your fold equity after the flop so you don't have to play three streets out of position.
erm so watch them for a bit and put them on a range preflop instead of just looking at your HUD stats.....?!?!