Most politicians have politically crafted smiles appropriate for every situation. But President Obama infectious smile seems to be genuine. Nancy Pelosi's smile on the other hand seems quite plastic, most likely a result of Botox injections and other surgical handiwork done to her face. Representative Boehner rarely smiles, but given the circumstances of the Republican Party there's not much to smile about these days.
I think the President Obama enjoys life, and he enjoys being president of the United States even under these trying circumstances. Nancy Pelosi enjoys power, lots of power, especially when she's wielding it. She's quite capable of smiling when she means the exact opposite. Therefore, I see her smile as something akin to a black widow spider smiling. Just because she smiling doesn't mean she's happy or that you're safe. John Boehner's smiles are few and far between. Actually, I don't think this is a result of the current situation of the Republican Party. Nor do I think it is a result of his unhappiness with the liberal left agenda of President Obama and Nancy Pelosi. I just think he innately lacks the ability to smile. I don't know if this has anything to do with him being a conservative Republican but I will do further research on this matter.
Both Senator Reed's and Senator McConnell's smiles are rather weak and given their ages not likely to change. I admit I haven't done prodigious amounts of research of these gentlemen during their careers and determine whether they were actually caught smiling at odd moments. I do know there is substantial research that indicates that if a person is genuinely smiling he or she will feel better. Maybe if the Republicans and Democrats smiled at each other, genuinely, things would get better in Washington. Oh well, one can dream.