Until Diebold voting machines stop returning suspicious results, including victories of Republican candidates in local elections by a margin of exactly 18181 votes*, they shouldn't be trusted to tally up our presidentail votes. Any voting machine should have its source code publsihed, then hard-coded into machines after verification by professionals and a chance to be scrutinized by knowledgeable members of the public.
*
http://www.alternet.org/story.html?StoryID=16474