Another curious characteristic of senate "lines" of questions is the incidence of addressee alignment by party. 11/93 Qs were dual-use, ie. one Q addressed to both (D) and (R) House+ POTUS managers. Respondents  received 5-min. each in sequence; alternating order of "side" leading response for this Q type assigned by C.J.

Accordingly, the remainder were exchanged between senator and managers along party line, ie. D-D, R-R/POTUS.

(All of my Top 5 are dual-use Qs, not coincidentally.)