One way to voice your support of a national health care system is to sign the petition at http://www.standwithdrdean.com/ .
Another is to write a letter to the editor of your local paper in support of the public option.
It's clear that Senate Republicans have no interest in passing health care reform. Their role is to gain concessions on the bill, leaving out any chance of real reform, after which they will vote against the bill anyway.
Get involved. Health care is a human right.