Daily Kos Elections' project to calculate the 2016 presidential results for every state legislative seat in the nation comes to Tennessee, where the GOP holds massive majorities in both chambers. You can find our master list of states here, which we'll be updating as we add new data sets; you can also find all of our calculations from 2016 and past cycles here.
Democrats ran both the Tennessee state House and state Senate from Reconstruction until the early part of the 21st Century. The GOP took a tiny Senate majority in 2004, but two Republicans voted to keep Democrat John S. Wilder, who had led the chamber since 1971, as speaker of the Senate. However, Team Red kept their majorities in 2006 and a Democrat delivered the pivotal vote that finally gave the GOP control.
A similar thing happened two years later in the state House, where the GOP seized a one-vote majority. Every Democrat backed Republican backbencher Kent Williams in the speaker race, keeping control out of the hands of the GOP leadership for another term. But the 2010 GOP landslide gave Republicans a hefty 64-34 majority (Williams won another two terms as an independent before retiring), and they got to draw the maps for both chambers. Today, just ten years after Wilder finally lost the Senate gavel and six years after the Republican leadership's choice finally took the speakership, the GOP holds a 28 to five Senate majority and a 74-25 edge in the House. Half of the Senate is up every two years, while the entire House is up each cycle.
Donald Trump carried Tennessee 61-35, a swing to the right from Mitt Romney's already-strong 59-39 win four years before. Trump took 27 of the 33 Senate seats, though he narrowly lost one Romney seat. SD-20, which is located in the Nashville area, went from 56-42 Romney to 47.3-47.1 Clinton, but Republican incumbent Steven Dickerson won re-election last year 56-44. All five Senate Democrats are confined to the Obama/Clinton seats, while the GOP controls all the Romney/Trump districts.
There's more crossover voting in the House, but still not very much.