Gee.....maybe.....compare 'em to
BILL CLINTON'S....before
HE WAS RE-ELECTED??!!!!

Or Bush. His popularity was tanking going into the '04 election. It's pretty hard to unseat an incumbent President.
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Really?
Tanking?
Zogby showed Bush polling at 41% approval in July 2004, then up to 46% by October 2004, and finally at 49.4% by November 1st, 2004.
So by your own account of history, if that is a mark of Bush "tanking", then what is happening to Obama's poll #s right now would indicate he is even worse than tanking.
Ouch.
WH2004: Full
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If you jump over to another pollster, Rasmussen we see the following:
Bush at 45% July 1st of 2005.
By October, Bush was at 46%.
By the end of October Bush was at 48%
So again, if that is a sign of someone "tanking" heading into the elections, then Obama's current polling would indicate a very serious problem for the current president if we are to uitilize your own standards.
RR Presidential Track Jul - Aug
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Keep your chin up kid...