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For this analysis, we need to know the margin of victory for either McCain or Obama for each state and the District of Columbia. We'll

For this analysis, we need to know the margin of victory for either McCain or Obama for each state and the District of Columbia. We'll use this variable to analyze how a district is going to vote vs how they actually voted. The `obama` and `mccain` variables within each dataset shows either the predicted support (polls08) or the vote percentage for that candidate (pres08). **For each dataset, create the variable `margin`, which represents Obama's vote margin over McCain in percentage points.**

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