Following his win last night in North Carolina, the Service Employees International Union (SEIU) claimed today that Barack ObamaBarack ObamaTrump takes office in tough place, but approval ratings do change Obama returns to personal Twitter: 'Is this thing still on?' WH photographer shares final photo of Obama MORE is the Democratic Party's presumptive presidential nominee.

SEIU endorsed Obama Feb. 15 and has worked to bolster support for him in the Democratic race. According to SEIU, its members have gone door to door and made phone calls for Obama, and SEIU has aired pro-Obama ads on television (see the union's Indiana ad here). SEIU claims 1.95 million members nationwide.