Extremist traits.

Character Assassination.
Name Calling And Labeling.
Irresponsible Sweeping Generalizations.
Inadequate Proof For Assertions.
Advocacy Of Double Standards.
Extremists Tend To View Their Opponents And Critics As Essentially Evil.
Extremists Tend To Have A Manichean Worldview.
Extremists Very Often Advocate Some Degree Of Censorship And Repression Of Their Opponents And Critics.
Extremists Tend To Identify Themselves In Terms Of Who Their Enemies Are.
Extremists Are Given To Arguments By Intimidation.
Wide Use Of Slogans, Buzzwords And Thought-Stopping Cliches.
Doomsday Thinking.
Extremists Often Claim Some Kind Of Moral Or Other Superiority Over Others.
Extremists Tend To Believe That It's OK To Do Bad Things In The Service Of A "Good" Cause.
Extremists Tend To Place Great Value On Emotional Responses.
Some Extremists...claim some kind of supernatural, mystical or divinely-inspired rationale for their beliefs and actions.

"Extremists Tend To View Their Opponents And Critics As Essentially Evil."

Like the hippie liberals who think us conservatives who want to remove foreign aid from our already balooning budget are selfish assholes. 

"Extremists Are Given To Arguments By Intimidation."

Like liberals who want to enforce their policies upon the populous using government guns as the final argument. 

"Extremists Tend To Identify Themselves In Terms Of Who Their Enemies Are." 

Like democrats who identify themselves as democrats based on the fact that Bush is a republican and they are anti-Bush. 

"Doomsday Thinking."

Like democrats who think that if a conservative gets elected, we'll have economic doomsday and everyone will be unable to find work. 

"Extremists Often Claim Some Kind Of Moral Or Other Superiority Over Others."

Like democrats who claim that they are morally superior to the conservatives because conservatives are selfish and we have a duty to help the poor. 

"Extremists Tend To Believe That It's OK To Do Bad Things In The Service Of A "Good" Cause."

Like liberals who say it's ok to use physical force and violence, if necessary, to make people pay their taxes for welfare, social security, the war, and foreign aid because it goes to a higher good. 

"Extremists Tend To Place Great Value On Emotional Responses."

Like liberals who encourage emotional responses to poverty...such as just taking money from the rich, and giving to the poor.  Redistribution of income. 

"Some Extremists...claim some kind of supernatural, mystical or divinely-inspired rationale for their beliefs and actions."

Like the liberal mystics who claim that their stealing from the rich to give to the poor is just because of their faith.