2020 Colorado US Senate Election-Will Gardner(R-CO) be more vulnerable than Heller(R-NV)is in 2018?

[nkpolitics1212]

Heller (R-NV) is facing a tough primary challenge from Tarkanian-R and a tough general election challenge from Rosen-D. Democrats will pick up the US Senate Seat in NV in 2018.
Gardner (R-CO) has a 24 percent approval rating according to PPP. He is also trailing Democratic challenger by 5 point margin 46-41. CO Democrats have plenty of candidates that could challenge and defeat Gardner in 2020.
Hickenlooper,Perlmutter,both of Hickenlooper's Lt Governors(Garcia or Lynne),2018 Democratic candidates for Governor (Kennedy or Johnston), or Hancock

[hlthe2b]

1. I sincerely hope so. I lost a dear friendship over my opposition to Gardner

And that elderly man has since died.
It seems only right that Gardner should get the boot after proving me right...

[politicat]

2. Gardner is going down, but for out of staters, focus on Heller and other 2018 vulnerables.

2020 will be Gardner's year of clarity -- he will develop hindsight and find his Wingnut Welfare seat. But for this cycle, it's in the overall best interest to ignore him. He's not well liked and is hanging himself with the state's electorate, so please, let him keep collecting rope.

[nkpolitics1212]

3. The reason why I brought up Gardner's likely vulnerability is because I have been a resident of CO

couple of months before Gardner narrowly defeated Udall in 2014.
Regarding the 2018 US Senate Election-There are 2 Republican held US Senate seats up in 2018 that are highly vulnerable.
NV-Heller-R and AZ-Flake-R. Democrats are waiting for a top or 2nd tier candidate to run in AZ. On the other hand Democrats are highly vulnerable in IN-Donnelly-D,MO-McCaskill-D,and ND-Heitkamp-D (if Cramer-R decides to run). Democrats are vulnerable but favored to win in FL-Nelson-D,MI-Stabenow-D,MT-Tester-D,OH-Brown-D,PA-Casey-D,WV-Manchin-D,and WI-Baldwin-D.
Democrats could end up with a net loss of 2 seats in 2018.
2020 could be the year Democrats regain control of the US Senate. We need a net gain of 4 seats assuming Trump loses re-election or 5 seats if another Russian hacking occurs in 2020.
Vulnerable Democratic incumbents up in 2020-Peters-MI,Franken-MN,Shaheen-NH,and Warner-VA will benefit from the Democratic Presidential nominee's coattails.
Democrats will pick up CO-Gardner-R,NC-Tillis-R,MT-Daines-R (if Bullock-D runs), ME-if Collins retires or gets defeated in the primary, and AZ-if there is a special election due to McCain's departure. Another scenario is Democrats will pick up CO,NC,IA-Ernst-R and GA-Perdue-R plus Trump loses re-election.