Are we being 'Un-American' when we question our government?

In an oped in USA Today titled "'Un-American' attacks can't derail health care debate," House Speaker Nancy Pelosi, D-Calif., and House Majority Leader Steny Hoyer, D-Md., attack those who've been raucously protesting health care reform at town hall meetings.
"These disruptions are occurring because opponents are afraid not just of differing views -- but of the facts themselves," the write. "Drowning out opposing views is simply un-American. Drowning out the facts is how we failed at this task for decades."
Pelosi and Hoyer say "an ugly campaign is underway not merely to misrepresent the health insurance reform legislation, but to disrupt public meetings and prevent members of Congress and constituents from conducting a civil dialogue. These tactics have included hanging in effigy one Democratic member of Congress in Maryland and protesters holding a sign displaying a tombstone with the name of another congressman in Texas, where protesters also shouted 'Just say no!'' drowning out those who wanted to hold a substantive discussion."
(continues at ABC News)