John McCain and Barack Obama's Debates Probably Won't Be Game-Changers

Gallup says that presidential debates usually don't change the race.

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If you watch the bloviators on the 24-hour news networks, you know that Friday night's debate (if it comes off) will be a game-changer—it's pretty well accepted conventional wisdom at this point.

But it's wrong, according to Gallup. Gallup looked at its polling numbers and found that only 1960 and 2000 were associated with meaningful shifts in public opinion.