Voters in northern New Jersey will select nominees in a special congressional primary to replace Democrat Mikie Sherrill in the U.S. House now that she's governor. The winner of the 11-candidate Democratic primary on Thursday will advance to the April 16 special election. The Republican primary is uncontested. The Democratic-leaning 11th Congressional District could further narrow the 218-214 Republican majority in the House. Two previously Republican-held seats in Georgia and California are also vacant. Sherrill was elected governor in November and was sworn in last month.