Exit polls should always come with health warnings as psephologists can go horribly wrong in their methodology as well as surveys. But, having said that, it should be a case of failure of modern election science itself, and not just any individual psephologist, if the Indian National Congress is not able to install a chief minister in Karnataka this month.
Three of the most credible pollster agencies with solid track records, that is, Axis MyIndia, Today's Chanakya, and CVoter have more or less predicted a victory on their own for the Congress over the BJP if not a clean sweep.

