Running a presidential campaign requires a certain amount of boiling down of ideas into easy sound bites and slogans. The opposition party candidate, in particular, must successfully define himself as the candidate of “change,” possessed of an ability to alter the nation’s course away from the “failed policies of the past.” The Democratic Party’s presumptive nominee, Sen. Barack Obama, D-Ill., is no exception. He knows he’s got to win over skeptics with simple messages, but at the same time offer specific proposals for true believers. And as much as any bloc in his party can be, labor leaders and activists are true believers.