Some will use the information in their databases to take the easy way out on issues. I think these politicians won't be successful. It will be those who can explain their opposition to voters, while retaining the general goodwill of those people, who will win the day. This is a completely different form of political organization, and political discussion, than exists in today's mass-market politics. There it's heat, not light, that rules.
Life is more complex.
Politics, and political systems, must come to reflect that complexity. Computers and networks are all about dealing with complexity, and the ubiquity of those networks will bring those advantages forward. It's a big job. The U.S. Constitution was forged at a time when the number of people discussing issues was small, when letters were the main medium of discourse and pamphlets the main form of advertising. An opportunity exists to bring some of those days back, but in a scaled format where everyone can participate.