The Sierra Club-Cascade Chapter, which took its lumps in last year’s election, has endorsed Suzan DelBene in an intense !st U.S. House District race in which five Democrats are vying for a place on the November general election ballot. The redrawn 1st District includes much of the North Cascades National Park, a wilderness area in which a half-mile-wide copper mine was once proposed, two of Washington’s great volcanoes — Mt.