Blogs' power demands responsibility ....It's not an extraordinary act when a news organization admits a mistake, but what CBS and Dan Rather did on Monday was extraordinary. They admitted that they no longer can vouch for the authenticity of documents used to support a story about President Bush's Vietnam War-era National Guard service, a topic that could swing a close election. It largely happened because of bloggers...... .... The blogging community, which calls itself the blogosphere, is riding high because a few bloggers are deservedly taking credit for shining a spotlight on the documents CBS used in its "60 Minutes...