John McCain would keep American troops in Iraq for 100 years. Barack Obama thinks white working class voters cling to their guns and religion out of economic frustration. Hillary Clinton thinks the 2008 Democratic nomination battle could end as horribly as the one in 1968. What do these statements have in common? First, the candidates actually said them. Second, they wish they hadn't. Third, they each illustrate how the weakness of a candidate's "brand" often projects the mirror image of ...