Is Illegal Immigration a Burden or a Blessing?

The President's latest proposal for immigration reform now includes stepped up border security and tamper-proof ID cards for guest workers.  But the road to legal status and citizenship for illegal immigrants still bothers members of both parties--especially Republicans.  With immigration reform seemingly stalled this year on Capitol Hill, cities and towns around the country are finding their own ways of dealing with newcomers.  We hear about "zero tolerance," with fines for employers and landlords of undocumented workers, and about places revitalized by illegal immigrants, who are opening stores, paying taxes and cooperating with local police.