"to fight for jobs without knowing what they are"

A quote from Reason:

...The quest for efficiency—whether with machines or foreigners—will continue to create more than it destroys. But since destruction will always remain a part of the process, there will always be another Pat Buchanan or John Kerry. Free markets will continue to be a tough sell because the tradeoff will always be the same: exchanging some of today's jobs for more and better jobs that often don't yet exist. Protestors rarely wave angry signs at protectionist politicians who would jeopardize future jobs, but it's not fanciful to fight for jobs without knowing what they are. After all, when they were in third grade, today's 30-something web designers could not have dreamed of what they would end up doing. Likewise, today's third graders have no idea what's in store for them...