Dip in unemployment seems to be well-timed

Is it merely coincidence that two days after President Obama does a less-than-stellar job in the debate against Mitt Romney that the unemployment rate dips, and I mean a micron below 8 percent? Is this figure to be believed? Is this just part of the campaign strategy? I also would like to know how the figures for July and August are now amended. I guess we just stop counting all the unemployed souls who are no longer searching for work. How can not seeking employment be construed as employed? I would love to hear answers to all my questions.
Jill M. Wierzba