Using blockchain in election isn't very new idea.
India’s citizens will soon be able to cast votes from outside their city of registration thanks to a blockchain-based system: https://cointelegraph.com/news/indias-citizens-will-vote-with-blockchain-election-commissioner-says
Even though this idea is not new, but it is not been implemented in many places of the world. If blockchain is used in election, there will be no tempering or manipulation in the results of the election. This would be a perfect system of choosing the political party fairly.
Also i assume that those countries where there is a lot of fraud in election process, they will not agree to adopt this method easily.