I think the same is true for comments: they need to be [dead] before you get a vouch button. Additionally, you have to click into the individual comment to see

I think the same is true for comments: they need to be [dead] before you get a vouch button. Additionally, you have to click into the individual comment to see the vouch button. (Glad to learn I am not on some secret Bad Voucher list. Thanks for commenting.)