 Leaders of the opposition refused to accept the results, citing PSB's exit poll as proof of fraud.The 20,000 responses in the exit poll produced a large amount of data, leading to an extremely low sampling error.According to the Center for Economic and Policy Research, because the chance of sample error in the exit poll was so low and observers did not find any signs of fraud, it may have been the survey's methodology that led to the discrepancy in results.