If Wisconsin's new domestic partner registry law is overturned, Wisconsin could be faced with quite the legal question.

Julaine Appling is with Wisconsin Family Action, which has filed a legal challenge against the registry with the State Supreme Court. The suit claims a 2006 Constitutional amendment makes the registry invalid.

If the lawsuit succeeds, Appling says it could be similar to a dilemma that California experienced last year. Voters in California outlawed gay marriage in November of last year, but courts let existing same-sex arrangements stand.

Same-sex couples in Wisconsin have been signing up for this state's domestic partner registry since Monday, and legal battles are expected to play out in the future.

AUDIO: John Colbert reports (MP3 :36)

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