Here's something I bet you haven't heard anywhere else: The Colorado House and Senate each could flip next year. OK, maybe you've heard half that. The Republicans hold just a one-seat edge in the 35-member Senate, which will see 17 seats on the ballot next year. But the House? Democrats enjoy a nine-seat majority in a chamber that, at best, has five competitive districts out of 65. Republicans would have to run the table or notch some surprises. So what does Ballotpedia know about 2018 that the rest of us who follow the Colorado statehouse don't? Math. Democrats hold seven seats in the House that they won by less than 10 percent last year.