A method and system for quickly and reliably processing a high volume of messages. In one embodiment, text messages are submitted by mobile phone subscribers to cast votes. The votes are recorded and replies are returned in near real time by updating a state in active memory for each subscriber that submits a message. To provide scaling and reliability, a message summary is also used to distribute the processing over a number of master-slave pairs that are each defined to access certain messages based on one or more message characteristics, such as an area code of the submitting subscriber. Campaign processing rules are applied to the summary to produce a subscriber state change, which indicates a corresponding reply to be returned. Billing and other administrative operations are done on a post processing basis so as not to slow the vote processing.
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