WASHINGTON -- Republicans and Democrats don't agree on much, but they do agree on this: the middle class. At their conventions, the two parties will compete fiercely for its support. Republicans will accuse Barack Obama of destroying the middle class through policies perpetuating high joblessness and feeble economic growth. Democrats will portray Mitt Romney as a tool of the rich who doesn't understand the middle class. To the victor may go the election, because "saving the middle class" has arguably become the campaign's defining issue. This is mostly political...

More...