[bigpooch]

It's a clear error in terms of EV in BBs. Even if exactly
one opponent is drawing to the same straight, there is also
a small chance that by pairing on an ace the hero can win.
So you can consider there to be approximately 13 outs out of
46. In addition, you will also gain more EV if it gets
capped 4-way, so not failing to raise is an error of more
than 0.15 BB and so it's still a clear error (a "whopper" to
borrow from backgammon lingo). On the other hand, there is
a tiny chance that these players will put in two bets cold
on the turn and surrender for another two! (But not in this
day and age! [img]/images/graemlins/smile.gif[/img] )