More turns in the Obama campaign’s position on 527’s, according to Marc Ambinder.

There’s been a spurt of 527 activity on behalf of Sen. John McCain, but Barack Obama campaign has suddenly gone silent on the subject.

That’s because, after a year of telling donors not to contribute to 527 groups, of encouraging strategists not to form them and of suggesting that outside messaging efforts would not be welcome in Obama’s Democratic Party, Obama’s strategists have changed their approach.