Presidential elections were held in Zimbabwe on Wednesday in the latest challenge to longtime President Robert Mugabe. Mugabe’s main challenger, Prime Minister Morgan Tsvangirai, called the elections a “huge farce” and accused Mugabe supporters of rigging the vote. A local observer group says up to a million people were prevented from casting their ballots. The African Union has voiced initial support for the vote, saying the elections appeared to be “peaceful, orderly, free and fair.”