A new Twitter hashtag designed to help fight misinformation against President Obama appears to have backfired in early use on Wednesday. President Obama's Twitter feed, which is run by his campaign staff, on Tuesday evening started promoting the new website AttackWatch.com and hashtag #AttackWatch, designed to fight misinformation against the president. The hashtag was already in heavy rotation by Twitter users by Wednesday morning, but many users are conservatives such as columnist Michelle Malkin, who offered up her own daily column as an example of an Obama "attack." The website is meant to be "the first line of defense against...