The 12th District includes Princeton, Trenton, and other Mercer municipalities, as well as parts of Middlesex, Somerset, and Union counties. Freshman Democrat Bonnie Watson Coleman is its representative. Watson Coleman, of Ewing, faces a primary challenge from Alexander Kucsma of Somerset. Republican Steven Uccio of East Windsor is unopposed. Once a competitive district, today Democrats outnumber Republicans more than two-to-one.