Simple query on a ManyToMany field?

Suppose I have the following models:

class Tag(models.Model):
  card = models.ForeignKey('Card')
  name = models.CharField(max_length=10)

class Card(models.Model):
  # whatever....

Say I have a list, like the following:  words = ['christmas', 'mother']

This list can be of variable length.  How can I write a query that
will return a list of Card objects that match ALL (not any) of the
words?  Is there a way to do it in a line or two without traversing
all of the card objects?

-- 
Adam Olsen
http://www.vimtips.org
http://last.fm/user/synic

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