AP source: Obama campaign begins buying ad time

[unable to retrieve full-text content]WASHINGTON (AP) ? President Barack Obama's campaign has begun buying advertising time in four states that will be critical to the president's re-election effort, a sign that the presidential campaign is entering a new phase.

Source: http://hosted2.ap.org/APDEFAULT/89ae8247abe8493fae24405546e9a1aa/Article_2012-01-18-Obama-Campaign/id-177df64302284bf4945d35a593ed1eda

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