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Do pollsters who don't call cell phones make the election look closer than it actually is? Polling maven Nate Silver of FiveThirtyEight.com thinks so. The traditional assumption is that young, cell-phone-only voters probably lean heavily toward Obama. It turns out that the four national polls that include cell phones in their samples are also the four polls that have him with the largest margins of victory. He charted it for you, too (after the jump):