Many liberals are dissatisfied with Obama's leadership skills in dealing with congressional Republicans. He has not met a lot of his campaign promises because of partisanship in congress. In the remainder of his term, Obama should take a hard stance and challenge Republicans. As the executive, he should use the power of his office more forcefully.
President Obama has his strong points and he may be concerned for the country, especially the poor and midle class, but he does not know how to get his pet causes dealt with. He does not have a winning personality or even the willingness to engage with those who do not agree with him it seems.