This changes nothing. Cook still has CO-SEN as a tossup.
Gardner would be more likely to win than Bullock. Trump is going to win Montana by atleast 20 points, that would be impossible for Bullock to overcome, also, he's running against an incumbent. Trump last time around lost by 4.9 points in Colorado, and Darryl Glenn barely underperformed him, and he was running against Bennet, who was an incumbent.
This time around, Hickenlooper is running against an incumbent, he is more gaffe prone than Biden, he has a lot of baggage, he compared himself to slaves, he thought George Floyd was shot, he ignored to show up for court, the ethics commision found him guilty and fined him, his ethics scandal cost taxpayers over 100,000 dollars, he's made numerous comments on camera that he would be a lousy senator, that's it's not for him, etc. He's even struggling to survive the primary without Schumer's help, and that's pretty pathetic for an outgoing governor. So it's not even likely that he will be the one to face Gardner.
If you honestly think that Steve Bullock is going to perform better than Gardner you obviously have a bias.
Amazing you have the audacity to be so obnoxious when it is you presenting the absurd, completely baseless asertion.