Facing an onslaught of opposition to health reform, the White House on Monday opened a “Reality Check” website with a viral tool aimed at online combat on everything from “rationing” to euthanasia. The site incorporates lessons learned from the Obama campaign’s “Learn the Truth About Barack Obama” site, which covered everything from the birth certificate to William Ayers to “a recent e-mail smear falsely claims Michelle ordered room service, but she never even stayed at the hotel.” Aides to President Barack Obama say the key is to respond to viral rumors with an aggressive, equally viral response. “We're offering the...