That is going to help Democrat party seal the future for them as well. We are going to see the whole nation who are against this new Republican party at the Democrat party, not like they were so awesome before, but right now the in fighting of that party made it even worse.
There is also the one where he fell from the bike as well. He is old, he is definitely very old, there is no doubt about that. However, at this point Republicans are a bit more in trouble than democrats about it, why? Because imagine a country that voted for a guy that was too old to do the job, instead of picking their candidate who was on a reelection campaign.
Trump had 4 years of presidency, and yet he couldn't get reelected against a guy who can't even finish a sentence. This is why it's quite important to realize that Republicans are responsible for finding a candidate that could actually get the votes to win, otherwise they are going to lose again.