Joe Klein accurately opines that a "bum economy" could cost Barack Obama re-election ["Why Obama's Not a Lock," May 23]. But by implicitly comparing Obama 2012 to Jimmy Carter 1980 and George HW. Bush 1992, Klein omits crucial factors that also cost those two incumbents re-election. Both Carter and Bush faced significant opponents (Edward Kennedy in 1980, Pat Buchanan in 1992).
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