Las Vegas ? Barack Obama, his campaign for the Democratic presidential nomination bolstered by endorsements, told a cheering union hall on Friday that he would provide relief for homeowners struggling to make mortgage payments and deliver tax cuts to the middle-class.

“We’re going to put money in the pockets of hardworking Americans who deserve it. That’s what I’m fighting for,” Obama told hotel and restaurant workers packed into the steamy union hall of the Culinary Workers Union, Local 226.

The union, the largest in Nevada, sided with Obama this week, an endorsement that boosts his chances in the state’s Jan. 19 caucus.

Earlier Friday, Arizona Gov. Janet Napolitano endorsed Obama’s candidacy, citing his message of hope over rivals Clinton and John Edwards.

The endorsement is a major gain for Obama. Napolitano, one of several female governors, is the most prominent Democrat in Arizona. Her endorsement could be significant in a state now regarded as winnable by a Democrat after decades as a near-lock for Republicans; the state holds its primary Feb. 5.