NL25: Top two vs. possible straight

[Emperor Norton]

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool (http://poker-tools.flopturnriver.com/Hand-Converter.php) from FlopTurnRiver.com (http://www.flopturnriver.com) (Format: 2+2 Forums)

Hero ($52.90)
UTG ($39.25)
MP ($50)
CO ($52.55)
Button ($49.25)
SB ($113.45)

Preflop: Hero is BB with 9/images/graemlins/club.gif, J/images/graemlins/spade.gif.
UTG calls $0.50, <font color="#666666">3 folds</font>, SB completes, Hero checks.

Flop: ($1.50) 7/images/graemlins/heart.gif, 9/images/graemlins/heart.gif, J/images/graemlins/club.gif <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $1.5</font>, UTG folds, SB calls $1.50.

Turn: ($4.50) 3/images/graemlins/club.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $4</font>, <font color="#CC3333">Hero raises to $13</font>, <font color="#CC3333">SB raises to $22</font>

Villain is pretty terrible donkey. I had seen him flat-call a raise with AA in position earlier, and open-limp his button with AQo. However, he's usually pretty transparent, in that he bets out with top pair or a draw. He might have a crappy two pair, or think that he's being clever with an overpair, but it's hard to say. Is this ever a fold?

[losingdonkey]

I pretty much always shove

[spyderracing]

If I know the guy's a huge donkey I'm felting this all day every day. I'd be more worried about a set here than a straight against a decent player. He may have AJ, KJ, QJ, JT, a flush draw, or a worse two pair here. Need to go with it.

[Dunkman]

There are certainly players I'd fold this against, but not many, and from what you said, definitely not this guy. Like you said, could be all kinds of stuff, most of which you're beating.