By tradition, the Speaker of the House votes at his or her
discretion, and typically does not vote. When the Speaker does vote, the
official source data from the Clerk of the House includes that information,
but when the Speaker does not vote, the data provided by the Clerk does not
include that information. In those cases, ProPublica adds a record showing
the Speaker as not voting and increases the total number of lawmakers not
voting by one (both in the Speaker's party and overall). In those cases,
the not voting totals provided by the API for House votes will not match
the Clerk's totals.