This article gives some specific anecdotes related to barriers to accessible voting.  People describe inaccessible polling places and barriers to voting in private.

Issues they describe include:

• Lack of privacy
• Inaccessible polling places
• Feeling rushed by people assisting them
• Doubts about the accuracy of the ballot marked by someone else
• Cost of mailing an absentee ballot (as a principle)
• Poor communication skills on the part of poll workers

Links

The Ragged Edge