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Fun isn't it? ;-)
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I could spin that... even within the same sample 90% of the people at T2 could be making above the average at T1... which over a 5-10 year period would probably have happened whether he won or not. The politician probably was vague enough that that point was missed.
Also, a few high earners could move the average significantly..., e.g., Bill Gates moves to town. Median would be more meaningful.
This kind of spin reminds me of when I talked to the director of a PhD program. He told me "half the graduates go into consulting and half into teaching." It was only later that I found out there had only been two graduates to that point! At that point I wasn't tuned in enough to ask the follow up question... today I'd be all over him. ;-)
John