DOCUMENT: Union letter to House Dem districts

A top building trades union is launching a midterm-election assault on House Democrats who oppose construction of the Keystone XL oil pipeline. 

A letter distributed Friday by the Laborers' International Union of North America (LIUNA) to the districts of 27 House Democrats calls for union members to make sure their representative "feels the power and the fury of LIUNA this November."

Laborers' International Union of North America letter to members on Keystone