Nearly 70 percent of Americans say they are concerned about illegal immigration, and more than half think the government should do more to prevent illegal immigrants from coming into the country. But there are experts on both sides of the political divide who say cracking down may not be a solution -- for both practical and economic reasons. While both President Bush and Sen. John Kerry support versions of guest worker programs, the public isn't convinced. NPR's Marcus Rosenbaum reports.

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