A 21st-century-record number of seats are opening, and races will be raucous and crowded, reflecting both parties’ ideological, stylistic and generational tensions.

Of all the primary elections on the March 3 ballot - from Tarrant County to Congress - these races are the ones we're watching closest.

The campaigning arm of the national congressional Democrats (somewhat) see the opportunity to pick up a seat in South Carolina's 1st congressional district.