President Obama's political advisers, looking for ways to help Democrats and alter the course of the midterm elections in the final weeks, are considering a range of ideas, including national advertisements, to cast the Republican Party as all but taken over by Tea Party extremists, people involved in the discussion said.

White House and Congressional Democratic strategists are trying to energize dispirited Democratic voters over the coming six weeks, in hopes of limiting the party's losses and keeping control of the House and Senate. The strategists see openings to exploit after a string of Tea Party successes split Republicans in a number of states, culminating last week with developments that scrambled Senate races in Delaware and Alaska.

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