Can I Raise With The Second Nuts Here?

[iggymcfly 0]

***** Hand History for Game 4385375814 *****$400 PL Omaha - Sunday, May 28, 20:24:08 ET 2006Table Table 95223 (No DP) (Real Money)Seat 1 is the buttonTotal number of players : 10 Seat 4: Sara525 ( $179.86 )Seat 7: HilleAJ ( $619.50 )Seat 8: RAMITJAMIT ( $750.55 )Seat 1: iggymcfly ( $1110.50 )Seat 10: southside_ ( $393 )Seat 9: RiskReward ( $805.70 )Seat 5: Agran05 ( $274 )Seat 6: KOBE8 ( $218.80 )Seat 3: bushbum ( $410.10 )Seat 2: Mai_Mitang ( $80 )Sara525 posts small blind [$2].Agran05 posts big blind [$4].** Dealing down cards **Dealt to iggymcfly [ 6d Ks Ah 8s ]KOBE8 calls [$4].HilleAJ calls [$4].RAMITJAMIT folds.RiskReward calls [$4].southside_ folds.iggymcfly calls [$4].Sara525 folds.Agran05 checks.** Dealing Flop ** [ Kc, 3s, 7s ]Agran05 checks.KOBE8 checks.HilleAJ checks.RiskReward folds.iggymcfly bets [$20.90].Agran05 folds.KOBE8 folds.HilleAJ calls [$20.90].** Dealing Turn ** [ Qs ]HilleAJ bets [$45].iggymcfly calls [$45].** Dealing River ** [ Jc ]HilleAJ bets [$50].I kinda get the impression that I'm up against a lower flush here, but I'm afraid that if I am I won't get called, and that if I'm up against the nuts I could lose a big pot. Plus, there's always the naked ace that come over the top and bluff me if I try a raise/fold line. Thoughts?

[amarillotg 0]

Party PokerPot Limit Omaha Ring gameBlinds: $2/$48 playersConverterStack sizes:UTG: $218.80UTG+1: $619.50MP1: $750.55MP2: $805.70CO: $393Hero: $1110.50SB: $179.86BB: $274Pre-flop: (8 players) Hero is Button with :D UTG calls, UTG+1 calls, MP1 folds, MP2 calls, CO folds, Hero calls, SB folds, BB checks.Flop: :) ($22, 5 players)BB checks, UTG checks, UTG+1 checks, MP2 folds, Hero bets $20.9, 2 folds, UTG+1 calls.Turn: ($63.8, 2 players)UTG+1 bets $45, Hero calls.River: ($153.8, 2 players)UTG+1 bets $50.Uncalled bets: $50 returned to UTG+1.Results:Final pot: $153.8i wouldn't feel confident in raising there. it wouldn't make sense for him to lead that turn with anything but a flush. since he's playing from up front i would imagine he's not dicking around with much other than the nuts.