Following his win last night in North Carolina, the Service Employees International Union (SEIU) claimed today that Barack ObamaBarack Hussein ObamaFormer NYT correspondent rips Democrats' 'selective use' of constitutional violations Obama portraits leaving National Portrait Gallery to tour museums across the country Tulsi Gabbard explains decision to sue Hillary Clinton: 'They can do it to anybody' 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.