It wasn't a shoe in after the loss in New Hampshire but they still decided to go with Obama.
From abc News
ABC News' Teddy Davis and Sunlen Miller Report: Despite losing Tuesday's New Hampshire primary, Sen. Barack Obama secured the endorsement of the Culinary Workers union.
The endorsement of the 60,000-member Culinary Workers union is seen as the biggest get in Nevada, a state which votes Jan. 19.
The panel making the decision is the executive committee of UNITE-HERE, Culinary's parent union.
“We believe that Obama is the candidate who can bring the country together and we are proud to support his candidacy," Shauna Hamel, Executive Vice President of the union says.
This is a pretty big endorsement. Coupled with the SEIU endorsement this gives Obama a powerful leg up in Nevada. Nevada isn't a big contest but a win is a win and delegates are delgates and with Hilary sporting the edge in delegates Obama doesn't need to take any for granted.