I know many find this hard to believe but President Obama is in over his head and people across this country are realizing that it is time to put someone in there who actually knows what he's doing.
The problem is, nothing indicates that Romney knows how to run a government.
He ran a state, a business and the Olympics.
The last two are irrelevant. (Indeed, based on prior examples, knowing how to run a business has typically been an indicator for being a bad president,) As for State government, past experience has shown that gubernatorial experience is no guarantee of being a good President. Granted, Cleveland, both Roosevelts, Reagan, and Clinton were governors, but so were Jefferson, Andrew Johnson, Wilson, Coolidge, Carter, and Dubya, so it certainly does not indicate things will be smooth. Since state governments typically have far more restrictions what they can do, saying a good governor will be a good president is like saying someone who is a good enough driver to get a safe-driver discount will also be a good enough driver to win the NASCAR Sprint Cup.
The last two are relevant, because they show what is necessary for economic activity and good administrative skills..
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He specifically said that, based on prior examples (Hoover, Carter, etc), having experience in business does not guarantee a successful presidency. Far from it, in fact.