I get where you're coming from, but it's not strictly true. For instance if their model had given Hillary a 99.5% chance and Trump only 0.5%, then we could be p

I get where you're coming from, but it's not strictly true. For instance if their model had given Hillary a 99.5% chance and Trump only 0.5%, then we could be pretty sure it wasn't a good model when Trump won. You might say even then, how do we know the result didn't just fall into that 0.5% remaining chance? But polls can and do still give some useful idea of what the result might be.