Time should be reserved at the beginning of each presidential debate for candidates to personally recant any false or misleading statements from the previous debate. Time spent recanting would decrease the time allotted to answer questions during the current debate. Fact checking would be the responsibility of a nonpartisan fact-checking organization agreeable to all candidates.
Why is this important?
Begin to have some "truth in politics" by requiring candidates to have factual basis for their statements, or personally admit they were inaccurate.
The public is bombarded with false and misleading political advertisements every election cycle. The 2012 election year will be rife with lies given the influx of Super PAC money.
While it would be optimal to rein in all false/misleading advertisements made directly, or indirectly, by a presidential candidate, the first step is requiring candidates to ensure statements they make during debates are factual.
Additionally, forcing candidates to recant their false/misleading statements live, in their own words, provides great incentive to ensure their statements are factual when initially spoken.