'"One day after the Culinary Workers Union endorsed Obama, the Nevada State Education Association—a teachers' union that while not officially endorsing Clinton, had top officials who did—filed a lawsuit seeking to eliminate at-large caucus sites that had been set up in nine Las Vegas resorts, saying they violated equal protection and one-person-one-vote requirements.The suit was viewed as a proxy legal battle between Clinton and Obama, as the caucus sites within the casinos would be primarily used by members of the CWU, who are more likely to vote for Obama.