Nate Silver argues that focusing on Obama's Ohio approval dip misses the bigger picture:

Obama's approval ratings have declined nationwide by perhaps 3-5 points since early May. I have little doubt that this has mostly to do with the flagging economy. Each day, a few more voters are going to blame Obama for the economic troubles that we're in. If the economy seems to be showing some "green shoots", as it did in March and April, then Obama will be fine -- voters don't expect the economy to turn around overnight. But if the economy isn't showing any signs of life -- and most of the economic news for the past 45 days or so has been pretty grim -- he'll fail to keep pace with those modest, but ever-increasing, expectations, and his approval ratings will decline.

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