My 2 cents on Exit Polls

Yesterday, I was looking at the Exit poll results of 2009 Elections on CNN-IBN and NDTV. They were giving all sorts of projections based on their survey.

In the CNN IBN survey, I had a look at the Bihar numbers(any state would do, I took Bihar since they had a round 40 seats which can easily divide any number). There were 1960 respondents from Bihar, which means 49 respondents per constituency. I assume each constituency as a few lac voters. How can 49 people represent these few lac voters?

I don't believe NDTV either, who have not even mentioned their sample size.

Hence I don't like to believe these numbers but would like to watch out for Saturday the 16th.