Why do people still have the idea that illegals vote?

Really.... very few people even bothered to look up this information.I lived in the US among both legal and illegal immigrants and never seen one vote. I researched on the internet and couldn�t find one case where a considerable amount of illegals voted in any elections. So, if any of you find this information, PLEASE post it. But I will ONLY accept information that comes from a credible sources like official government sites or major news chanel and it must be significant, not a case where only one illegal commited election fraud 5 years ago. It must be something that weights on the nation like hundreds or thousands of illegals voting during elections. So, if you find this info PLEASE post it so I can change my mind about the issue. In case no one gives me anything valid I will assume that this story that illigals vote is a taboo and a bunch of crap.