The crowd erupted in applause.
Obama was scheduled to address the convention Friday.
Clinton went on to campaign at the Culinary Workers Union hall, a group currently embroiled in prolonged contract negotiations with casino giant MGM Mirage Inc.
Its endorsement is coveted by each of the Democrats in the field, and both Obama and former vice-presidential nominee John Edwards have promised to walk the picket line with members should the MGM talks lead to a strike.
Clinton made the same promise Thursday, before a group of about 400 union members.
"Let me be clear, I believe in negotiations," she said. "But if it comes to a strike, I will be with you on the picket line."
The promise appeared welcome, but was received with skepticism by some in the union, which represents hotel and restaurant workers in Las Vegas casinos.
"My first thought is, I'll believe it when I see it," said Lynn Baker, 49, a waitress at the Excalibur hotel-casino. The union has set a strike vote for Sept. 12.
Clinton later campaigned at a house party for campaign workers in a Hispanic neighborhood in Las Vegas, before heading to Los Angeles for a presidential candidates forum on gay and lesbian issues.
- Associated Press
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