As President Obama heads into the first of three debates with Mitt Romney nursing a slight lead in the polls, he has a wealth of historic precedent to draw on, and no shortage of advice -- much of it unsolicited -- to guide him.Some 17 must-dos and don't-dos were passed along to RCP by scholars, experts, and political practitioners -- but long before the litany became that extensive, it emerged that one obvious pitfall for presidential candidates is over-analyzing the debates ahead of time.Overthinking is not a candidate’s friend.If Obama -- and Romney, for that matter --...

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