There is no impeachment until the court in the Senate receives the paperwork, until then there's nothing to even talk about
But it will get talked about and it will get brought up ad nauseam until it becomes "true" in the minds of voters. What better way to impact his re-election bid than having him embroiled in a trial defense? Negative imagery on screens all over the world is better than any paid for TV or Radio ad. I suspect the average voter believes what the talking heads tell them is true over giving actual critical thought to a candidate and their vote.
Of course, it isn't just the President impacted either...how many Senator re-election campaigns can be interrupted by forcing said Senator to be in Congress rather than running their re-election campaign?
Of course, I am sure this is me just putting on a tinhat again. No Politician would ever abuse the system for political gain. They have way too much respect for us voters and this country for those kinds of shenanigans.