Does anyone really believe that one person not in the most powerful position in the FBI could effect an entire election? Doesn't Comey's decision(Comey being at the time the FBI director)to make a statement about the Clinton investigation just days before the election show that there was zero way for Strzok to effect an election since the FBI director made a decision that can be argued hurt Clinton tremendously right before the election, and helped Trump get elected?
Second, in Strzok's text he said, paraphrasing here, we won't let it happen. Why is the assumption that we meant the FBI or some deep state, anti-Trump group? Doesn't it make more sense that he meant democrats?
1. I think this is why the IG probably used the term "willingness". Is it any worse if Strozk was willing to throw the election but couldn't do so, versus if he could? The moral calculus is the same. It doesn't really matter if he had the actual power; it's the intent.
But, the answer is I don't know. Clinton blames Comey for her loss; it's possible that hundreds of thousands of people changed their minds based upon the "Crooked Hillary" narrative. Similarly, it's possible that the Trump / Russia connection, either in 2016, 2018, or 2020, can have a significant impact on the electoral process. And, remember, it was Strozk that changed the Clinton recommendation from "grossly negligent" (illegal) to "extremely careless" (not illegal). A Clinton indictment under the criminal standard certainly would have hurt her electoral chances; changing the wording to non-criminal helped her instead.
Think of it this way: a lot of people feel that Trump is obstructing justice, trying to shape the investigation from the outside. Strozk was potentially shaping the investigation from the inside. That's dirty, and the guy shouldn't be an FBI agent.
2. It's open to interpretation, but I think the IG thought there was more to it than "America will never let that happen" or "Democrats will stop it". There are other concerning texts, as well, including one from Lisa Page that said (paraphrasing) "Clinton could be our new boss soon, so are you sure you we should be digging into this?"
"She might be our next president. The last thing you need us going in there loaded for bear," Page, an FBI attorney, said in a discussion on February 25, 2016, about personnel involved in the investigation. "You think she's going to remember or care that it was more doj than fbi?"
"Agreed," replied Strzok, who was romantically involved with Page, and who led the probe as the former No. 2 counterintelligence official at the bureau.
That one is more self-interest career-wise than it is partisan bias, but it's the same problem: dereliction of duty for external reasons.