A leading national tea-party group, anticipating big electoral gains for conservative Republicans, is laying plans to maintain pressure on new members of Congress after the Nov. 2 vote.

According to an internal memorandum reviewed by The Wall Street Journal, Tea Party Patriots, an umbrella group that says it works with nearly 3,000 local groups around the U.S., is planning a multipronged campaign that includes advertising, polling, hundreds of rallies, and a summit of newly elected members of Congress early in 2011.

Tea Party Patriot leaders say they are gearing up both to fight Democratic efforts to pass legislation during the lame-duck congressional session and for a struggle with conventional Republican leaders over the loyalties of new members of Congress.