But just because they don't perceive themselves as liars doesn't mean they aren't liars.

Here, for the record over at biographybase.com, is a list of some of Nader's accomplishments:

Ralph Nader Biography
Ralph Nader (born February 27, 1934) is an activist who targets large American corporations on environmental and consumer rights issues. He was the U.S. presidential candidate of the Green Party in 1996 and 2000. In both runs Winona LaDuke was his vice-presidential running mate.

He is an independent candidate in the 2004 U.S. presidential election.

Early career
Ralph Nader was born in Winsted, Connecticut to Lebanese immigrant parents, Nathra and Rose Nader. He graduated from Princeton in 1955 and Harvard Law School in 1958. In 1963, then 29, Nader hitchhiked to Washington, DC and got a job working for then Assistant Secretary of Labor Daniel Patrick Moynihan. He did freelance writing for The Nation and the Christian Science Monitor and advised a Senate subcommittee on automobile safety.

Clash with the automobile industry
In 1965 he released Unsafe at Any Speed, a study claiming many American automobiles, especially those of General Motors, to be structurally flawed. GM tried to discredit Nader, hiring private detectives to investigate his past and attempt to trap him in a compromising situation, but the effort failed. Upon learning of this harassment, Nader then successfully sued the company for invasion of privacy, forced it to publicly apologize, and used the winnings to expand his consumer rights efforts.

Activist movement
Hundreds of young activists, inspired by Nader's work, came to DC to help him with other projects. They came to be known as "Nader's Raiders" and, led by Nader, they investigated corruption throughout government, publishing dozens of books with their results:

Nader's Raiders (Federal Trade Commission)
Vanishing Air (National Air Pollution Control Administration)
The Chemical Feast (Food and Drug Administration)
The Interstate Commerce Omission (Interstate Commerce Commission)
Old Age (nursing homes)
The Water Lords (water pollution)
Who Runs Congress? (congress)
Whistle Blowing (punishment of whistle blowers)
The Big Boys (corporate executives)
Collision Course (Federal Aviation Administration)
No Contest (corporate lawyers)

In 1971, Nader founded the NGO Public Citizen as an umbrella organization for these projects. Today, Public Citizen has over 150,000 members and numerous researchers investigating Congress, health, environmental, economic, and other issues. Their work is credited with helping to pass the Safe Drinking Water Act and Freedom of Information Act and prompting the creation of the Occupational Safety and Health Administration (OSHA), Environmental Protection Agency (EPA), and Consumer Product Safety Administration. Their various divisions include:

Buyers Up
Citizen Action Group
Congress Watch
Critical Mass Energy Project
Global Trade Watch
Health Research Group
Litigation Group
Tax Reform Research Group
The Visitor's Center

Non-profit organizations
In 1980 Nader resigned as director of Public Citizen to work on other projects, especially campaigning against the believed dangers of large multinational corporations. He went on to start a variety of non-profit organizations:

Capitol Hill News Service
Corporate Accountability Research Project
Disability Rights Center
Equal Justice Foundation
Georgia Legal Watch
National Citizens' Coalition for Nursing Home Reform
National Coalition for Universities in the Public Interest
PROD (truck safety)
Retired Professionals Action Group
The Shafeek Nader Trust for the Community Interest
Congress Accountability Project
Citizen Advocacy Center
Pension Rights Center
Foundation for Taxpayers and Consumer Rights
Center for Auto Safety
1955: Princeton Project 55
1969: Center for the Study of Responsive Law
1970s: Public Interest Research Groups
1970: Connecticut Citizen Action Group
1971: Center for Science in the Public Interest
1971: Aviation Consumer Action Project
1972: Clean Water Action Project
1972: Center for Women's Policy Studies
1980: Multinational Monitor (magazine covering multinational corporations)
1982: Trial Lawyers for Public Justice
1982: Essential Information (encourage citizen activism and do investigative journalism)
1983: Telecommunications Research and Action Center
1993: Appleseed Foundation (local change)
1994: Resource Consumption Alliance (conserve trees)
1995: Center for Insurance Research
1995: Consumer Project on Technology
1997?: Government Purchasing Project (encourage the government to purchase safe and healthy products)
1998: Center for Justice and Democracy
1998: Organization for Competitive Markets
1998: American Antitrust Institute (ensure fair competition)
1999?: Arizona Center for Law in the Public Interest
1999?: Commercial Alert (protect family, community, and democracy from corporations)
2000: Congressional Accountability Project (fight corruption in Congress)
2001?: League of Fans (sports industry watchdog)
2001: Citizen Works (promote NGO cooperation, build grassroots support, and start new groups)
2001: Democracy Rising (hold rallies to educate and empower citizens)

Now, if that is a dismal record of failure, I'll take back what I said about Dan being a liar, and a disingenuous one at that.

But it looks to me, as I peruse the above list, that either Dan doesn't know what he is talking about and is so ignorant that anything he says should be immediately dismissed as mere ranting. Or he is lying.

Since he seems otherwise intelligent, I feel confident in my conclusion he is the latter.