Seats leaning Dem vs. Rep were 205 vs. 198 as of 10-9-18.
Of the 32 Toss-Ups, 11 are Open seats undefended by an incumbent (2 formerly Dem, 9 formerly Rep).
The remaining 21 are defended by Republicans but are too close to call as of 10-9-18. Retaining all those and losing all the Open seats would give Republicans a slim 1-seat majority of 219 to 216.
