I am not sure that blockchain technology can be used in the election polls or not but if we can implement this technology in elections we can eliminate fake voters and non favourable leaders from the government ruling place and can make this world as better place than now.
If this technology can be implemented then any government will implement that? What is your view on this!
Some elections have already been using the blockchain technology. I don't remember in which country though. It was in Switzerland or a country in Africa. Not a big election, just a local one. So yes it can be used, and it has many advantages, like fighting frauds, and so on.