A Democratic grassroots organization seeking to conduct at least 500,000 substantive conversations with voters across the battleground map this year announced Thursday it is expanding its list of targets to more than 60 contested congressional and state races. The group, Swing Left , is growing its list of targeted races from 33 House battlegrounds to 63 House, Senate and governor’s contests this fall as it expands its “ Ground Truth ” program — which began as an ambitious effort to knock on