Logging in by Email isn't responding

here i guess i wrote Every thing to be able to log in by mail but it's
not working is there something missing please? and
AUTHENTICATION_BACKENDS = (
'mayapp.backends.EmailAuthBackend',
'django.contrib.auth.backends.ModelBackend'
)

backends.py

from django.conf import settings
from django.contrib.auth.backends import ModelBackend
from django.core.validators import email_re
from django.contrib.auth.models import User, check_password

# Overwrite the default backend to check for e-mail address
class EmailAuthBackend(object):
"""
Email Authentication Backend

Allows a user to sign in using an email/password pair rather than
a username/password pair.
"""

def authenticate(self, username=None, password=None):
""" Authenticate a user based on email address as the user
name. """
try:
user = User.objects.get(email=username)
if user.check_password(password):
return user
except User.DoesNotExist:
return None

def get_user(self, user_id):
""" Get a User object from the user_id. """
try:
return User.objects.get(pk=user_id)
except User.DoesNotExist:
return None

views.py

def login_user(request):
state = "Please log in below..."
username = password = ''
if request.POST:
if 'login' in request.POST:
username = request.POST.get('username')
password = request.POST.get('password')

user = authenticate(username=username, password=password)
if user is not None:
if user.is_active:
login(request, user)
state = "You're successfully logged in!"

return render_to_response('master.html',RequestContext(request))
else:
state = "Your account is not active, please contact the site
admin."
else:
state = "Your username and/or password were incorrect."
elif 'signup' in request.POST:
form= SignUpForm()
context = {'form':form}
return
render_to_response('Sign_up_Employer.html',context,context_instance=RequestContext(request))

return render_to_response('login.html',{'state':state, 'username':
username},RequestContext(request))

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