The Senate routinely takes voice votes for which no rollcall division is recorded.
But there is generally little incentive to make votes private because in general legislators want to engage in credible credit-claiming (including about margins of passage and rates of bipartisanship) and parties want to preserve the whip as well.
But there is generally little incentive to make votes private because in general legislators want to engage in credible credit-claiming (including about margins of passage and rates of bipartisanship) and parties want to preserve the whip as well.