The war costs are a bit tricky. For one I don't think that the 1.5 trillion number is correct, and god knows if anyone actually can figure out exactly how much they cost. Second the obama administration mad multiple increases to the appropriations to the war in the realm of ~300 bil. Do you blame Bush for that or Obama.
Also, really what CAN you blame the president for? Starting a war, yes. But many other costs are brought about by congress, NOT the president. In a large part of Bush's time it was a democratic congress, and in a large part of Obama's its been a republican one (or at least republican enough to stop any spending.)