intro: Will a weakening economy make Mitt Romney president? Will a strengthening economy keep Barack Obama in office? Interest rates, GDP, unemployment, taxes and fluctuations of the stock market have all played decisive roles in past elections -- sometimes to pundits' surprise.
Take Ronald Reagan: By January 1983, when Reagan was half-way through his first term, interest rates had hit 20 percent, unemployment was rising, and the nation lay gripped by what was then the worst recession since...
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