Clinton Rossiter was an interesting man, a professor of mine. He wrote a book called "The American Presidency" and taught a course on it. One of the themes was that the President had many different roles. I think that's being ignored in the liberal angst over Obama's deficiencies as what I think Rossiter called: "Chief Legislator". The meme is that Obama is not a good negotiator; he doesn't play hard ball well enough; he gives away the farm too early in the negotiations. People cite LBJ as the polar opposite; someone who played the game very well, always searching for an edge and a master of persuasion.
The meme may well be true, but one thing worth remembering is the many (16 maybe?) roles of the President. Not every person will do every role well. Nor is a person's performance under his own control, much is dependent on circumstances. Beating up Obama may feel good to liberals, but they ought to stick pins in their Sarah Palin doll instead.