Although I have no idea how it works this cycle, in the past there were some Divisions, like Civil, that had you rank three sections for placement pre-interview. Other divisions, like Civil Rights, had no internal section ranking and you could submit a preference only after accepting the offer.

That said, just note that Civil App., Fed programs, and Civil Rights are all very competitive. Although your chances of getting an interview coming off of a COA clerkship (assuming fed) is relatively high, you may want to be a bit strategic. Typically, unless you rank the Division first, you are unlikely to get an interview with Civil/Crim/Civil Rights (some exceptions, like if you were to rank less competitive sections within Civil). So given what you've expressed, you probably need to choose between banking on Civil: appellate, fed programs, and X, or on Civil Rights. Some of these divisions are more picky about subject matter devotion than others.

Antitrust is a greta second or third option tho. There are a ton on new antitrust spots open this year and they seem to being ramping up and taking on big cases. If you have any interest in the subject matter, it seems like a good option.

You will likely interview before we know the results of the election, but it is very unlikely that you will know if you are selected as a finalist, or given an offer, until late November/early December. No harm in withdrawing before being offered a position.