Getting it right?

What responsibility do bloggers have to make sure that what they post is right? I read a blog today which highlighted the tussle between Prime Minister Julia Gillard and Opposition Leader Tony Abbott in today's election. Well, no gold stars here because it is not a Federal election but a NSW State election which has little to do with the ongoing leadership of Australia. So what do bloggers do, if anything, to ensure their personal opinion/comment is based on some sort of fact?