Very briefly:
In the mid years of Bush, the D Senate filibustered more than usual in regards to nominations of non-Supreme Court judges.
In 2006, when Democrats took the Senate, the Republicans started filibustering up a storm. But no one in the press noticed because Bush would have veto'd anyway, so the balance of power didn't shift.
As soon as Obama was elected, the Republican Senate had an internal meeting where they agreed to filibuster everything all the time -- legislation, judges, executive appointments, everything. Even legislation they supported, just to throw a wrench into the plans. It was a momentous change. The press failed to point it out or make an issue out of it. And here we are.