Voting is a fundamental right for citizens of a democratic society.
It should also be private unless the voter chooses to share who he or she votes for.
For the disabled the act of casting a ballot and/or keeping it private is not always a given.
Here is an article about the recent elections in Canada, and some contrasting information on how New Zealanders vote.
Note: the article from the Canadian Press is written by a blind journalist though it isn’t stated in the article.
http://www.nugget.ca/2018/06/07/voters-report-accessibility-issues
http://www.elections.org.nz/resources-learning/voters-disability