"We, the People" . . . and Health Care Reform

The preamble to the United States Constitution contains these words, "We, the people of the United States, in order to form a more perfect union, establish justice, ensure domestic tranquility, provide for the common defence, promote the general welfare, and secure the blessings of liberty to ourselves and our posterity, do ordain and establish this constitution for the United States of America."

When Congress, elected by "the People" to represent them and their interests, is faced with legislation that should be "for the good of the People as a whole" (such as health care reform), it is surprising that members vote along party lines.  Regardless of political affiliation, we, "the People" are an amazing cluster of people who all need good health care.

How do members of Congress accurately reflect the needs and interests of "the People?"  How do they make their decisions in ways that are for the highest good of as many "of the People" as possible?