Voting Practices of the Differently Abled
Source: The RespectAbility Report

Why are people with disabilities less likely to vote than their non-disabled peers?
People with disabilities are often socially isolated, which makes them less likely to be asked to vote by friends, family members, co-workers and political organizations.
People with disabilities often have less access to resources that are linked to higher voter turnout, such as income and education. This can lower their perception of their own political value.
People with disabilities can be discouraged by barriers involved with getting to polling places and using voting machines and materials, both of which make voting more time-consuming and difficult. These barriers may create a perception that people with disabilities are not fully welcome in politics.