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Someone made a good point about die hard fans, and how they will stop voting when their idol is gone. But there have to be a percentage that are American Idol fans, and therefore will participate even after their favorite is gone.
I think it is possible Katharine picked up a good percentage of fans from Mandisa. I think those 2 have the best vocals of the top 12, and Mandisa's fans probably recognize that. Katharine also talked about God and what his plans were for her, and I know that Mandisa has strong religous beliefs that she talked about regularly. So maybe Katharine got some fans from that as well.