Egyptian blogs have published amateur video footage purporting to show ballot stuffing and vote fraud in a nationwide referendum on constitutional amendments which opposition groups say was rigged.Egypt says it won 76 percent approval in Monday's vote for the amendments, which give the state powerful tools that could be used to drive opposition Islamists from politics. Rights groups say the changes are a step backward for freedom. A handful of video clips, most of which appear to be taken by mobile phone cameras and circulated on Egyptian blogs and websites, contain some of the first images of alleged fraud in the vote and could reinforce the accusations of vote fixing.