Ya there are some houseplants, orchids in particular, where you don't water them by pouring water in--you actually have to put them under running water for a lil bit, to fully saturate the roots. It emulates tropical environments where you get a whooole lotta rain, but there isn't much soil to capture it (because all the biomass is immediately taken up by all the plants :) )

I also heard that generally they want people's windows to be unobstructed when a VIP comes over, so its possible the plants were moved there away from window sills by the Secret Service when they came in first to make sure everything was prepared for Thrillary's illustrious visit.

Doesn't matter if it is actually growing out of the sink, your first perception will be that it is, unless you went through that scenario yourself. Not everyone has big plants growing in their house. (My parents did, but we had saucers.)