PeOfEo, that's a very good point.
What I'm doing is use PHP to reject comments shorter than 100 chars or longer than 1500 chars.
"I'm sorry but your post has 1600 characters and the limit is 1500"
Then I take the information he entered and put it back into an identical form.
So he is faced with the form as it was when he clicked submit. No need to click the back button (because the 'back button' on IE will erase anything entered into the textarea).
The fact that users are informed that there is a 1500 limit but they do not know the length of their input (until they submit) will actually encourage them to be as succinct as possible and use a length way below this limit 'just to be sure'.
Or at least that's my logic. I'll have to see this in action for a while to make sure I'm right.
oh BTW, don't you think it would be better to keep political statements for political forums? I strongly support palestinian demands for statehood, freedom and justice yet you don't see me posting any flags or making political statements.