Betting odds on Labour retaining power have fallen after last night's TV debate. 
Labour is paying $1.44, down from $1.53, with Australian agency Centrebet following Helen Clark's performance on TV3. 
Don Brash's National is $2.62, up from $2.37, as Centrebet punters continue backing Clark's Labour. 
Earlier this week, a Centrebet
         
        
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