Brendan Kirby:
1.) History favors the party out of the White House.
2.) President Donald Trump’s approval rating is low.
3.) Republicans are defending many more open seats.
4.) Democrats are winning the money race.
5.) The polls favor Democrats.
6.) Democrats have outperformed Republicans in special elections.
https://www.lifezette.com/2018/10/six-reasons-why-republicans-should-still-worry-about-midterms