The Polls

While polls can often mislead, recent polls show the following realistic breakdown for the next Knesset:

Avoda 25
Kadima 30
Likud 20
NRP + NU 20
Shas 10
UTJ 5

What this implies is that if the RZ and the chareidim were to join forces on one list, then there is a realistic chance that the religious would run the country. Why is this not happening? How can we expect anything of the non-religious if we can not find unity among those who share faith in the Torah?