Most senior White House staff members typically come from the president's campaign staff. This group possesses firsthand experience and understanding of the president's agenda. Although other sources exist, they are less common in direct appointments to senior roles. ;
Most senior White House staff members come from the president's campaign staff, as they have firsthand experience and alignment with the president's agenda. While professors, judges, and Congress members can contribute to the staff pool, they are less commonly selected for direct appointments. Therefore, the correct answer is A. The president's campaign staff.
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