The JS Politifact judgement of Steve Kagen's Social Security attack ad on Reid Ribble was definitive:
To make his case that Reid Ribble wants to "phase out" Social Security, Kagen lifts a choice 14 words from a 2009 forum. Snipped out: The fact Ribble immediately goes on to say he is worried about the future of Social Security and believes the current system will need to be replaced or modified. Kagen’s statement splices and dices -- and leaves the truth on the cutting room floor. Strike another match. We rate the statement Pants on Fire.
Go to the link for the whole thing. It includes the note that Kagen spokesman Allison Jaslow did not get back to the JS on their request for elaboration on the charge.