OMAHA, Neb. (AP) — Denise Powell won the Democratic primary in Nebraska’s 2nd Congressional District on Wednesday in a contest focused on the state’s “blue dot” status in presidential elections. The Omaha-area district, where Republican U.S. Rep. Don Bacon is retiring , is one of Democrats’ biggest targets this midterm season. It’s also a national focus every four years in presidential contests because Nebraska is one of just two states that splits its electoral votes. The 2nd District has gone