This cycle, 17 out of 35 of the seats in the Colorado State Senate are up for election, and Democrats currently control the chamber by a margin of 7 seats.
The Colorado House and Senate are currently under Democratic control, but are both competitive this year. While the Democratic Party is seen as possessing the advantage, the chambers are in contention and will be a race to watch.
Polls close in the state at 7 p.m. local time, or 9 p.m. EST.