Everything that happened the entire 8 years Bush was President was laid at his feet, INCLUDING the 4 years Congress was not controlled by the Republicans. Almost 3 years into Obama's Presidency and according to the same people he is not responsible for anything.
If you want to acknowledge that Bush was in fact responsible for everything that happened on his watch,
then yes, you earn the right to proclaim Obama responsible for everything that has happened on his watch.
Does this mean that you proclaim Obama responsible for everything that has happened on his watch?