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The campaign hopes to take Iowa and New Mexico out of the Republican Party’s column, which would push its total to 264 - putting it within six electoral votes that the campaign expects to find in at least one of six remaining tossups: Colorado, Indiana, Virginia, Nevada, Nebraska or Florida.

“When you look at the battleground states that will determine the presidency, we feel very good about where we are,” Mr. Plouffe told reporters.

But Republicans expect to hold red states that the Obama camp has targeted, and hope to pick off Pennsylvania or Michigan, where the Real Clear Politics average of polls gives Mr. Obama a narrow two percentage point lead. A Republican victory in either state would be devastating for Mr. Obama’s chances.