Why do libs say this economy goes all the way back to Reagan, but then they also brag about Clinton's surplus?

How can that be since Clinton was president after Reagan. Clinton could have gotten rid of every single thing that Reagan put into place. On top of that starting when Obama became president, he also could have also eliminated any conservative policy while he had both the house and Senate under democratic control. So, bottom line is blaming Reagan for the start of today's lousy economy is pretty far fetched isn't it?