This article is a collection of statewide public opinion polls that have been conducted relating to the April, May, and June Democratic presidential primaries, 2008. Pennsylvania Pennsylvania winner: Hillary Clinton Format: Primary see: Pennsylvania Democratic primary, 2008 Date: April 22, 2008 Delegates at stake 188 Delegates won To be determined Tracking Polls Polls Indiana Indiana winner: Hillary Clinton Format: Primary see: Indiana Democratic primary, 2008 Date: 6 May 2008 Delegates at stake 72 Delegates won To be determined The sample set for some polls in this table is not unique and overlaps with polls from previous days. These polls are marked as Tracking Polls. Indiana Tracking polls North Carolina : Barack Obama Format: Primary see: North Carolina Democratic primary, 2008 Date: 6 May 2008 Delegates at stake 115 Delegates won To be determined The sample set for some polls in this table is not unique and overlaps with polls from previous days. These polls are marked as Tracking Polls. North Carolina Tracking polls West Virginia West Virginia winner: Hillary Clinton Format: Primary see: West Virginia Democratic primary, 2008 Date: May 13, 2008 Delegates at stake 28 Delegates won To be determined Kentucky Kentucky winner: Hillary Clinton Format: Primary see: Kentucky Democratic primary, 2008 Date: 20 May 2008 Delegates at stake 51 Delegates won To be determined Oregon Oregon winner: Barack Obama Format: Mail-only Primary see: Oregon Democratic primary, 2008 Dates: May 2–20, 2008 Delegates at stake 52 Delegates won To be determined Puerto Rico Puerto Rico winner: Hillary Clinton Format: Primary see: Puerto Rico Democratic primary, 2008 Date: June 1, 2008 Delegates at stake 55 Delegates won To be determined South Dakota South Dakota winner: Hillary Clinton Format: Primary see: South Dakota Democratic primary, 2008 Date: June 3, 2008 Delegates at stake 15 Delegates won To be determined Montana Montana winner: Barack Obama Format: Primary see: Montana Democratic primary, 2008 Date: June 3, 2008 Delegates at stake 16 Delegates won To be determined 2008 United States Democratic presidential primaries Democratic