Why AP called Nevada Senate race for Catherine Cortez Masto

Read MoreA batch of votes from the Las Vegas area gave Democratic incumbent Sen. Catherine Cortez Masto a 5,000-vote lead late Saturday that The Associated Press determined she would not relinquishA batch of votes from the Las Vegas area gave Democratic incumbent Sen. Catherine Cortez Masto a 5,000-vote lead late Saturday that The Associated Press determined she would not relinquish