Was I brain dead?

[mcguw]

Okay,I sucked out at the end of this hand, but I think my thought process was still valid. Below is the hand, followed by my thought process. Keep in mind, at this point the table was very passive and it had been a long time since the pot was raised pre-flop. Post-flop it seemed to fold to any bet.

PokerStars No-Limit Hold'em, $0.50 BB (7 handed) FTR converter on zerodivide.cx

MP1 ($66.30)
Hero ($25.75)
CO ($19.75)
Button ($9.15)
SB ($66.35)
BB ($20)
UTG ($94.05)

Preflop: Hero is MP2 with 8[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, Hero calls $0.50, CO calls $0.50, Button calls $0.50, SB completes, BB checks.

Flop: ($2.50) 7[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets $2</font>, <font color="#CC3333">CO raises to $5</font>, Button folds, SB folds, BB folds, Hero calls $3.

Turn: ($12.50) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets $4</font>, <font color="#CC3333">Hero raises to $13</font>, CO calls $9.

River: ($38.50) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $7.25 (All-In)</font>, CO calls $1.25 (All-In).

Final Pot: $47

My thought process was as follows:
I limped pre-flop because I had okay position and was fairly sure I would not be raised. If I was raised, obviously I would fold.
On the flop I attempted to steal with a small bet. This was probably a mistake. However, when I was raised, I was thinking that I was probably against top pair, trying to price out a flush draw (The mini-raise was not big enough to price it out based on pot odds). I figured that if a club came, It would be a good opportunity to bluff. The club came, and he mini-bet. After thinking for about 20 seconds, I made a real raise with air. In this situation, was this a good opportunity to bluff, or should I have folded?