BTN is a loose passive guy with stats of 64/7%/1.0 as of 50 hands or so. CO had only played 3 hands so I don't think his stats are all that relevant.
Poker Stars $0.05/$0.10 No Limit Hold'em - 7 players -
View hand 41020
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CO: $3.00
BTN: $9.40
Hero (SB): $8.75
BB: $10.45
UTG: $5.15
UTG+1: $5.20
MP: $5.50
CO posts a big blind ($0.10)
Pre Flop: ($0.25) Hero is SB with A

K

UTG calls $0.10,
1 fold, MP calls $0.10,
CO raises to $0.50, BTN calls $0.50,
Hero ???
Not sure if limping is a better play here or re-raising here with 2 limpers ahead of me. For flush purposes the more the merrier but for A or K on the board purposes don't know if it is.
Should I call or re-raise? I know a fold is out of the question. No real info on CO and I don't think BTN would have flat called with AA or KK.