By JASON L. RILEY
THE WALL STREET JOURNAL

So, whatever happened to immigration as a presidential campaign issue?

In the early caucus and primary states – Iowa, New Hampshire, South Carolina – the media assured us that immigration was foremost on the minds of voters. You couldn't watch a Republican debate without the issue dominating a good chunk of the discussion. And when Hillary Clinton appeared to endorse a proposal in New York state to give driver's licenses to illegal immigrants, it was considered a major stumble, and the senator spent weeks trying to clarify her remarks.

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