Okay, the story goes like this: An Ex-Cop is hired by a Casino owner to find his ex-partner who the cops believe is killing a bunch of people. The thing is, he has to catch him soon because the bad guy REALLY hates this senator, and they believe that hes gonna assassinate him. Meanwhile, the bad guy forms a cult with some guys and the good guy has to gun 'em all down.
If you need any more details, e-mail me.
Ok, maybe that doesn't make much sense.
My Two Bits,
Bread
maybe, the bad guy couldve kidnapped the senator, dressed him up, and when the fighting broke out, shoved him into the crossfire with a toy gun in his hand.
the bad guy wins.
The senator in question was facing the revelation of a scandal that would have ended his career. He set the whole situation up, somehow-- he knew the bad guy hated him, and made sure that the bad guy would be gunning for him. The senator set the good guy up to gun the bad guy down in a blaze of glory so that he could earn the public's sympathy and no one would notice the scandal. It sounds pretty simplistic, but I think it would be very powerful, if handled right.
"We don't feel emotions; we do emotions." -- Anthony Robbins.
Well, you said you wanted bizaare.
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Expanding on E. Flask's scandal, the senator had an illegitamite child, and the bad guy is the senetor's son.Or.... The senator is pulling a Bullworth and actually wanted to die, and therefore makes it harder for the good guy to win.
Or.... The ending scene has the good guy with a gun to the bad guy's head, but then it turns out that the good guy is actually part of the cult so he turns and shoots the senator.
Explain this whole cult thing, because why would a random bad guy have a cult following when he just wants to kill the senator? 
Nobody would ever expect that one. 
My Two Bits,
Bread
Hope these help.
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Okay, who put the stop payment on my reality check???
Let me explain the "lead lemming" principal. The lemming at the front advances the suicide rush because he is afraid of getting trampled by the rushing lemmings behind him. The lemmings behind rush foward to keep up with thier laeder.
An old bit of hippy wisdom I read that explains how ideas, how movements, how leaders lose control.
You said in the first post that the killer was his ex-partner. While doing the legwork like any good private eye the hero identifies with the killer. Due to his past experiences his understanding of the killer's psychology is complete.
In the confrontation the lead flies, the flesh drops, the blood spills. The two ex partners are at a standoff and try to talk eachother into surrendering with some terse aggressive dailogue. Total psychic warfare.
The killer in order to maintain a cadre of willing, loyal followers must have a philosophy that fulfills some profound emptyness within them. Remember Tylers "Our Great Depression" speech.
THe hero end runs him psychologically causing the villan to commit suicide. That or better still leaves him speechless, stuttering, livid, shaken nad most of all distracted. This gives the hero the chance to kill him in a spectacularly gruesome way.
The cult, bloodthirsty and longing is impressed. Those that fled when thier leader died trickle in and in a series of events similar to the ones discovered by the hero during the killers tracking he is led down the same path his former partner took.
You can end the story as he's rushing toward the edge.
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