Yes, Obama did say McCain's ads were 100% negative. But it wasn't factual at all.
Obama, while remaining calm and collected, lied on more than one occasion during last night’s debate. The first over-the-top instance is when Obama accused McCain of running ads that were 100% negative.
PolitiFact sets the record straight:
Here’s how one exchange went:
Obama: “And 100 percent, John, of your ads — 100 percent of them have been negative.”
McCain: “It’s not true.”
Obama: “It absolutely is true.”
Obama appears to be cherry-picking the ads run during a single week — from Sept. 28 to Oct. 4 — during which the Wisconsin Advertising Project found “nearly all” of McCain’s ads were negative. That week, they found that 34 percent of Obama’s ads were negative.
But McCain has aired many, many ads that were not negative. If you look at a report from the same organization on Sept. 17, they found that in the week after the conventions, for example, Obama aired a higher percentage of negative ads than did McCain (76 percent to 56 percent).
In all, the Wisconsin Advertising Project has found that 73 percent of McCain’s ads have been negative, to date. That’s far short of 100 percent. (It also found 61 percent of Obama’s ads have been negative.)
That’s up for both parties from the 2004 election, when 64 percent of George Bush’s ads were negative, compared to 34 percent of John Kerry’s.
So Obama might be right for one week, but he is way off for the overall campaign, when McCain’s negative ads accounted for 73 percent. That’s so far off that we find it Pants on Fire wrong. (Emphasis mine)