There are more than these two duties:
Aside from breaking tie votes in the Senate and stepping in when the president can’t fulfill his responsibilities, vice presidents have developed these new responsibilities:
They lead commissions and other efforts on particular topics as a way for the president to show focus on that area. Al Gore, for instance, led a “reinventing government” effort for President Bill Clinton.
They travel abroad, especially when the president isn’t ready to commit to some sort of deal with another country but wants to send a high-level emissary.
They serve as advisers whose loyalties are clearly to the president and not other groups.
Heels Up Harris failed in the only duty assigned to her...secure the border,