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For President Obama and Senate Democrats, it's all about mutual aid. The president needs their support to achieve whatever of his remaining agenda he can get through Congress. They need him to help raise money for their re-election campaigns.
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The approach taken by Sen. Mary Landrieu's first official Republican rival, Rep. Bill Cassidy, in his announcement video is worth noting. Whoever eventually wins the GOP nomination to oppose the three-term Democratic senator could very well use the same playbook.