THE Senate has 80 members. A constitutional amendment requires a two-thirds majority of the full membership, which means 54 affirmative votes are required.
Assumed voting bloc
If one assumes:
Group Seats
Zanu PF 33
Chiefs 18
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Tshabangu- 17
aligned
opposition
senators
Total potential “Yes” votes 68
Under this scenario, CAB 3 would have a potential 68 votes in favour.
Margin above the threshold
Required to pass: 54
Potential support: 68
Difference: 68-54 = 14
This means supporters of the Bill could lose up to 14 votes and still achieve the required constitutional majority.
Blocking threshold
For the Bill to fail, affirmative votes would need to fall below 54.
Therefore: 68-15 = 53
According to this arithmetic, a minimum of 15 members from the assumed pro-CAB 3 bloc would need not to contribute to the affirmative vote (whether through voting against, abstaining where applicable under parliamentary rule, or absence).
Illustrative scenarios
Scenario
Pro-CAB3 votes
Result
Full support (68) 68
Passes
Loss of 10 votes 58
Passes
Loss of 14 votes 54
Passes
Loss of 15 votes 53
Fails
Key caveats
This analysis depends on several assumptions:
All 33 Zanu PF senators vote in favour.
All 18 chiefs vote in favour.
All 17 Tshabangu-aligned senators vote in favour.
The Senate membership remains at 80 for purposes of calculating the constitutional threshold.
Parliamentary rules and constitutional requirements are applied in the conventional manner for constitutional amendments.
Analytical conclusion
Under the assumptions above, the decisive number is 15.
A potential pro-CAB 3 bloc of 68 senators is 14 votes above the constitutional threshold of 54, meaning the Bill would only fail if affirmative support fell by at least 15 votes from that assumed starting point.