While I did not make a prediction about the overall election,
I did predict that Kadima would underperform the pre-election polls. Kadima was surveyed to receive 37 seats just prior to the election (down from a high of 42-45). Kadima ended up with 28, which is 32% less than predicted.
Not all of my reasoning behind the prediction was on-target, however, and I certainly did not forsee the blowout victory that the Left won on the socioeconomic front. That will, in my opinion, will have disastrous long-term effects.