In the early hours of a September Wednesday, Stefany Shaheen claimed the Democratic nomination for New Hampshire's 1st Congressional District, stepping into a political lineage while staking a claim of her own. The seat, vacated by Representative Chris Pappas in pursuit of a Senate bid, drew nine candidates who recognized its significance in the national arithmetic of House control. Shaheen's victory over Marine veteran Maura Sullivan and a crowded field places her at the center of a November contest that both parties understand as something larger than a single district race — a referendum, i