From your Charts - Look at the margin of victories. A 4% margin is considered a good win. What candidates won either of your states by more than 4%? List them and answer this question - Why do you think someone would win by a BIG margin?(Texas, Tennessee) Find one Google fact to justify why such a big win.
In Texas, Greg Abbott won by a margin of 13% and John Cornyn won by a margin of 9%. In Tennessee, Bill Lee won by a margin of 21% and Marsha Blackburn won by a margin of 10%.
One reason a candidate might win by a big margin is if they have strong party support and a large base of loyal voters. Additionally, they may have run a particularly effective campaign that resonated with a broad swath of the electorate.
According to a Google search, Bill Lee won by such a large margin in Tennessee in part due to his strong support among evangelical Christians and his conservative stance on social issues.