Senate Republicans started the cycle with a good electoral map that gave them some hope that they could gain seats, even in a mid-term election when history strongly suggests that they should lose them. But, a growing schism in the Republican Party is threatening to erode many of the advantages Senate Republicans have, and is beginning to jeopardize their ability to gain seats as they are forced to fight multiple primaries that have the potential to provide Democrats with opportunities that didn’t exist just a month ago. CONT.
Jennifer E. Duffy, Cook Political Report