If this is from Thirteen Days... I think it boils down to, don't get shot down and don't report it, otherwise the US would respond with war...which is what we tried to avoid during this time period.
While the vice president’s role as president of the Senate is largely ceremonial, in cases of a tie vote (50-50) on a bill, the vice president can break the tie.
<span>It prevented/discouraged voting by Blacks and Republicans.
</span>