The mixed reactions from those on the Left regarding Ron Paul seems to me to come the collision between two very strong perspectives or attitudes.
On the one hand, liberals believe in a strong role of the government when it comes to ensuring an equitable and just society. We don't believe anybody should be left behind and those who would lessen the common good for their individual benefit should be thwarted. We believe it does take a village and a corporation shouldn't dump toxic waste into the nearby river because it is cheaper.
The conundrum arises because in the modern world, the village has to operate in many or most cases through the state. Whether it is educating our children, enforcing environmental laws, assisting those in poverty, or dealing with our global neighbors, it is the state - local, state and federal - that has take at least the lead role in the matter.