100NL Basic PF question

PokerStars No-Limit Hold'em, $1.00 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($161.05)
SB ($143.50)
BB ($20.05)
UTG ($149)
UTG+1 ($90.05)
Hero ($102)
MP2 ($51.70)
CO ($117.60)

Preflop: Hero is MP1 with J, J. CO posts a blind of $1.50.
UTG raises to $4, 1 fold, Hero ???

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Villian is an unknown.

What's your move here PF?

I call an unknown and play the flop.

$12 and hope I get AA/KK in an orbit or two.

I re-raise this. No reason not to. If he is an unknown to you, than you are an unknown to him. Just because he raises it to $4 utg, doesn't mean he has QQ-AA. Probably has some broadway cards, or some pp if he is an aggressive player. If he plays back at you, you can easily fold, and this play will help establish you as a "loose" player, so you will probably get more action.

Edit: Just wrote what Fnord said and that is what I would do. He explained in a much briefer fashion

Also reraising makes it more likely you get heads up, instead of oop in a multiway.

stars players make it so easy for you to make the correct play becuase they try to play goot and oh so standard. reraise.