I watched most of the Democratic debate last night and have come to the following conclusion. Hillary Clinton is very knowledgeable about policy. Always answered questions in terms of what she had done in the past and how that would move her forward. Barack Obama was extremely visionary and focused more on how his actions would be based on principles, rationalizing his actions this way.
My theory is that, if you are familiar with the Myers-Briggs Type Indicator, Clinton supporters are more of the T(hinking)-type, whereas the Obama supporters are the F(eeling)-type.
I am speaking of the base of support here. This would not apply to strategy-minded people who simply support Obama because he is NOT Hillary since she would be the greatest unifier of the Republican party. It is the obsessed supporter types of which I speak. (i.e. Obama makes me feel so great!, or Hillary's experience is what we can count on!)