DES MOINES, Iowa — President Barack Obama and Republican rival are working feverishly for an increasingly smaller but crucial slice of the electorate — white, working-class voters. These clock-punching voters — from Iowa’s tiny manufacturing cities to Virginia coal country to pockets of Ohio reliant on the auto industry — are considered the potential tipping point in battleground states that will decide the winner on Nov. 6. These voters are also critical to turning less competitive states such as Michigan into suddenly swing states in the final stretch. Romney is trying to expand what polls show is an advantage for the Republican while Obama hopes to narrow the...
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