You know, you might as well post how his predictions have fared vs actual results:
2/27
South Carolina: prediction-Clinton 60.50%, actual-Clinton 73.88% (13.38% bias in favor of Sanders)
3/1
Minnesota: prediction-Clinton 52.02%, actual-Sanders 61.69% (13.71% bias in favor of Clinton, got the winner wrong)
Colorado: prediction-Sanders 52.94%, actual-Sanders 59.36% (6.42% bias in favor of Clinton)
Virginia: prediction-Clinton 68.49%, actual-Clinton 64.63% (3.86% bias in favor of Clinton)
Arkansas: prediction-Clinton 65.34%, actual-Clinton 69.03% (3.69% bias in favor of Sanders)
Massachusetts: prediction-Clinton 58.02%, actual-Clinton 50.72% (7.3% bias in favor of Clinton)
Oklahoma: prediction-Sanders 53.49%, actual-Sanders 55.54% (2.05% bias in favor of Clinton)
Alabama: prediction-Clinton 72.86%, actual-Clinton 80.22% (7.36% bias in favor of Sanders)
Texas: prediction-Clinton 59.42%, actual-Clinton 66.30% (6.88% bias in favor of Sanders)
Tennessee: prediction-Clinton 67.26%, actual-Clinton 67.09% (.17% bias in favor of Clinton)
Georgia: prediction-Clinton 73.99%, actual-Clinton 71.70% (2.29% bias in favor of Clinton)
Vermont: prediction-Sanders 71.33%, actual-Sanders 86.34% (15.01% bias in favor of Clinton, but I think this can be handwaved as a home state advantage)
3/5-3/6
Kansas: prediction-Sanders 57.85%, actual-Sanders 67.75% (9.9% bias in favor of Clinton)
Louisiana: prediction-Clinton 66.18%, actual-Clinton 75.42% (9.24% bias in favor of Sanders)
Nebraska: prediction-Sanders 62.28%, actual-Sanders 57.15% (5.13% bias in favor of Sanders)
Maine: prediction-Sanders 61.62%, actual-Sanders 64.39% (2.77% bias in favor of Clinton)
3/8 aka the day people actually started paying attention to this guy
Michigan: prediction-Sanders 53.48%, actual-Sanders 50.77% (2.71% bias in favor of Sanders)
Mississippi: prediction-Clinton 81.94%, actual-Clinton 83.39% (1.45% bias in favor of Sanders)
general thoughts: idk lol
(note that as far as margins of victory go, multiply the "bias" by 2, I also removed all non-Clinton/Sanders votes from the actual results to bring it in line with the predictions)