None of these adds, approach anything like arguing that either McCain or Obama was having secret talks with OBL. Obama's campaign is trying to push the NRA's ads about his record with 2nd amendment rights off the air. There is no reasonable way to consider them legally slander.
And generally (and properly IMO) the standard for libel or slander or defamation in the US, esp. with regard to public figures, is quite high.
--------- In 1964, however, the court issued an opinion in New York Times Co. v. Sullivan, dramatically changing the nature of libel law in the United States. In that case, the court determined that public officials could win a suit for libel only if they could demonstrate "actual malice" on the part of reporters or publishers. In that case, "actual malice" was defined as "knowledge that the information was false" or that it was published "with reckless disregard of whether it was false or not." This decision was later extended to cover "public figures", although the standard is still considerably lower in the case of private individuals.
In 1974, in Gertz v. Robert Welch, Inc., (418 U.S. 323), the Supreme Court suggested that a plaintiff could not win a defamation suit when the statements in question were expressions of opinion rather than fact. In the words of the court, "under the First Amendment, there is no such thing as a false idea". However, the Court subsequently rejected the notion of a First Amendment opinion privilege, in Lorain Journal Co. v. Milkovich. In Gertz, the Supreme Court also established a mens rea or culpability requirement for defamation; states cannot impose strict liability because that would run afoul of the First Amendment. This holding differs significantly from most other common law jurisdictions, which still have strict liability for defamation.
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