He hasn't blamed Bush since 2008, but his supporters have. And honestly the Republicans will do the same thing if a Republican is elected in 2016.
Of course, the most hilarious argument I hear from Obama-bots is that Bush "spend recklessly on two wars", which is the only time they care about government spending.
Democrats don't just like spending money.
Spending billions and billions on killing thousands of Americans and Iraqis possibly to no good end whatsoever = bad.
Spending money to give Americans healthcare and improve our economy = good.
I know it's a complicated concept. We actually don't like spending money per se. Think about it like a business, ExxonMobil spends billions of dollars each year. But, they don't go bankrupt because they get something out of it. Or, like if someone buys a house and takes out a mortgage. You could say, "hey buddy, why not raise your family in a studio apartment, that's would be cheaper." But, you get some utility out of a house and it's an investment.
That's part of what government spending is, an investment. You pay teachers so you have the resource of educated citizens. You build infrastructure which has a multiplier effect. You build a bridge and it saves people time and money crossing a river. In an economic recession, you spend money so you get people back to work and out of the downward spiral of economic contraction.
Is this a foreign concept to you?