Here are three very LEGIT reasons.
1. During Obama's reign the 2 parties are as seperated as they have ever been. Every past president was able to come up with compromises to get what he wanted passed. Even the dreaded George W. Bush couldnt have done what he did without the help of the Dems. I just dont see him managing to get back in the type of graces he needs to be in to get things done. Look at the book coming out and recently released audio transcripts from Obama admitting that had he known Ryan was attending the meeting he never would have said the things he said. "it was a mistake". I dont think Obama can fix the seperation that he has largely caused.
2. Obama has no idea how to fix the economy. Erskine Bowles pointed out how Obama's budget plan wasnt even taken seriously and voted down 97-0. Where as he praised Ryan as being a sincere guy who wanted to fix the economy.
3. Obama's energy plan is hurting much more than helping at this point. Basically any thing that requires coal is off the table. He said something like we arent saying people cant open businesses using coal, we will just fine them so much they will go bankrupt.
This is something we have to get a grip on. Yes, we are tearing up the earth and destroying the atmosphere and depleting resources. Thats what population does. We have 4 billion people on the planet and we live the way we do. The only thing that is going to change the consumption of resources is awhole lot less people consuming those resources. By all means spend money on research to lead to more environmental friendly energy sources in the future. Right now, we have to do what we have to do. If we blow out the ozone, whats the worst that happens? Alot of people die, the earth repairs itself, and things start over. Isnt that what most liberals want anyway?