Forget Kansas. This chart shows why Republicans need to worry about 2018

Political Washington is in the midst of a heated debate over what — if anything — the somewhat-closer-than-expected special election in Kansas on Tuesday means for next November’s midterm elections.

No matter where you come down on that question — I think there were clear warning signs for Republicans in their victory — the history of the first midterm election of a newly-elected president should scare Republicans tasked with retaining their House majority in 2018. CONT.

Chris Cillizza, CNN