CO is terrible. Loose/passive/donkish to the max.

Party Poker No-Limit Hold'em, $ BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP1 ($247.45)
MP2 ($266.95)
MP3 ($198)
CO ($90.25)
Button ($250.65)
SB ($201)
BB ($218)
UTG ($188)
UTG+1 ($229)
Fnord ($207.60)

Preflop: Fnord is UTG+2 with A, Q. SB posts a blind of $1.
UTG calls $2, 1 fold, Fnord raises to $10, 3 folds, CO calls $10, Button calls $10, 2 folds, UTG calls $8.

Flop: ($43) K, Q, 2 (4 players)
UTG checks, Fnord checks, CO checks, Button checks.

Turn: ($43) 5 (4 players)
UTG checks, Fnord bets $30, CO raises to $60, Button folds, UTG folds, Fnord ???

Call is 30, he's got another 20 behind.