There has been a lot of talk amongst the chattering classes lately about Obama looking the other way as Saudi Arabia, Turkey and Qatar have been supporting the local al-Qaeda affiliate in Syria against the Assad government. For a long period of time American arms "accidentally" flowed freely into the hands of the radical Islamist jihadis of al-Qaeda and ISIS. Then the "journalism" outlets started to get on board with the program.

It comes out now that Obama has specifically encouraged his "vetted moderates" to cooperate more closely with the Islamists:

Americans are intimately familiar with the city of Fallujah. It's where the Sunni resistance to the occupation of Iraq was born, and where nearly 100 American soldiers lost their lives in the bloodiest battle of the Iraq War. More than 1,500 civilians were killed and over 70,000 buildings were destroyed in those battles.

The Fall of Ramadi is becoming a game-changer. Not for the defeat itself, but for the response. In particular, the military offensive to retake Ramadi.
The most obvious element of how things have changed is the composition of the Baghdad army.