[Django]-How do I get access to the request object when validating a django.contrib.comments form?

The comments framework provides a comment_will_be_posted signal:
http://docs.djangoproject.com/en/1.2/ref/contrib/comments/signals/#comment-will-be-posted

If you register at this signal, your handler will be passed the (not yet saved) comment object and the request as arguments. If your handler returns False, the post_comment view answers with CommentPostBadRequest, as it does on any other sort of error like failed form validation.

One possible way, but you still do not have request object in this level of validation…

class SomeForm(forms.ModelForm):
    somefield = forms.CharField(...)

    def check_somefield(self):
        somefield = self.cleaned_data['somefield']
        ...  #do what you want
    return somefield

Hope this can help, or i do not understand what you want correctly.

I think this is the answer to your question:

How do I access the request object or any other variable in a form's clean() method?