python - django: why am I getting this error: AttributeError: 'method_descriptor' object has no attribute 'today'?

I have the following python code:

from django.db import models
from datetime import datetime

class Poll(models.Model):
    question = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
    def __unicode__(self):
        return self.question
    def was_published_today(self):
        return self.pub_date.date() == datetime.date.today()

In a python shell, I am trying to run:

p = Poll.objects.get(pk=1)
p.was_published_today()

The first line works fine but the second line gives me this error:

AttributeError: 'method_descriptor' object has no attribute 'today'