August 8, 2014 4:25 pm Obamas to Arrive on Martha's Vineyard This Weekend President Barack Obama and his family are headed for a vacation on Martha’s Vineyard. US & World Videos 2:36 Tracking blistering cold temperatures on Mount Washington 3:34 DOJ ordered to step up immigration enforcement 2:07 Federal agents seen conducting operation in East Boston 3:11 Electric vehicles in Massachusetts: Are we meeting our goals? 2:24 Primary care doctor shortage leads to long wait times in Mass.