Must voters have to prove citizenship to register?

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Must voters have to prove citizenship to register?
from AP Top Political News At 5:39 a.m. EST by By JESSE J. HOLLAND and JACQUES BILLEAUD
WASHINGTON (AP) -- The Supreme Court will struggle this week with the validity of an Arizona law that tries to keep illegal immigrants from voting by demanding all state residents show documents proving their U.S. citizenship before registering to vote in national elections....
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