If you are referring to the chart you should know that we show the leading contenders for the Republican nomination for a particular Congressional District where the General Election in November is expected to be competitive. In general the Key House Races list is all about removing incumbent Dems from office. So in most of the Districts there is an incumbent Dem who is most likely running unopposed for the Dem nomination and several Republicans vying for their party's nomination.
The real fight will be November 2.