The Colorado State House is truly a toss up.
Each party has 26 safe seats. It takes 33 seats for a majority in the lower chamber.
Over the last few election cycles the Colorado GOP has been clobbered by the Democratic Party in the state house elections. The GOP believes that it can now match the Democratic Party in these races. These are new districts so a lot remains to be seen.
Currently the GOP has control of the State House 33-32.