The two-million-member Service Employees International Union will be focusing its substantial resources – it has set aside more than $75 million between now and November – on states that have not been traditional battlegrounds.

The union’s secretary-treasurer Anna Burger said the S.E.I.U. would devote money and staff to Colorado, North Carolina and Virginia. The union’s strategy appears to dovetail with the Obama campaign’s plans to compete in those states, all three of which President Bush won in 2004.