Let me explain my process. I take the 538 and realpol polls lists. Find the mean. Average that with the Rasmussen poll. Then I make micro-adjustments based on my own reading of the race. (For example if 2 people are within a percentage but I feel the order is wrong like in SC, I'll re order. Or if someone is several points off ill arbitrarily soften the difference and attach the extra percentage to the top candidates - why my % were so far off on bottom three in SC). Then I make sure my numbers add up to 100% and arbitrarily add the tenths of percentages needed to make it do so. It's not scientific but it has the veneer thereof. In other words, it's somewhat proprietary to me.
