I have the figures themselves*.
This 0.3% drop is unique.
* Here they are:
1980 (Carter) SEP 7.5% (-0.2%) added 113k jobs
1984 (Reagan) 7.3% (-0.2%) added 311k
1988 (Reagan) 5.6% (0) added 340k
1992 (Bush) 7.6% (0) added 35k
1996 (Clinton) 5.2% (+0.1%) added 219k
2000 (Clinton) 3.9% (-0.2%) added 125k
2004 (Bush) 5.4% (0) added 161k
2008 (Bush) 6.2% (0) lost 432k
2012 (Obama) 7.8% (-0.3%) added 114k
There are several reasons why this isn't significant:
For one and most importantly, just because it is the largest change does not mean it was rigged. There has to be some largest number in any sample size. By that sort of logic one would have said prior to this week that Clinton rigged it in 2000, Reagan rigged it in 1984 and Carter rigged in 1980.
Furthermore, September is pretty arbitrary as is having data from only 1980 onwards.
Also, a 0.3 percentage point drop from 8.1 is about a 3.7% drop. A lot of the other numbers here are a greater percentage drop. The higher you get, the greater drops you naturally expect. In other words, going from 10% to 9% is easier than 1% to 0% for mostly obvious reasons.
On top of all this there is nothing to suggest the BLS doesn't do what it always did. That they deviated from their normal methodologies.
All in all, a very weak case on your part.
I think those pushing this rigged numbers theory need to just accept U3 dropped and move on. The election isn't lost yet.