What's the best way to get the best deal on a new car when paying cash?

I bought my first car I few years ago and was able to pay in full but I think I made a mistake in letting the sales agent know I was going to pay cash from the jump. Will dealerships generally sell a car for less money if a customer intends to pay cash for it? What are some Haggling tactics I can use to get the price down further before I let the sales man know I am going to pay cash and hopefully have them mark the price down even further?