He said the campaign has not ruled out taking action if the race tightens.
The latest figures show Carmona trailing by some 78,000 votes with nearly half a million ballots still uncounted. Victory for the Democrat would be uphill climb by any reckoning, but it's mathematically possible. His campaign notes that there are up to hundreds of thousands of uncounted provisional ballots that could also affect the race.
Carmona conceded the race on election night, telling his supports, "We didn't win tonight, but when you look at the results it's clear that Arizona is moving toward moderation."
Now his campaign is wondering if it was too soon.