The midterm election campaign will end Tuesday, but one of its most marked developments -- the emergence of outside groups, often backed by anonymous donations, that can direct waves of advertising into political battles -- is just getting started.

Buoyed by the impact their blistering, anti-Democratic campaigns have had this year, two of the largest new conservative groups helping Republicans are planning to keep pushing their agenda in the lame-duck session of Congress that will begin in two weeks and are already laying the groundwork for a more aggressive campaign in the 2012 presidential race.

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