When you try to pass a difficult bill at the Dark Assembly, the only option normally available to you is to kill all of the opposing senators simply because it's nearly impossible to get a difficult bill passed legally. But who wants to constantly get into fights in which they're massively outnumbered by high-level enemies?

Here's a nice trick to bypass the entire process. Before choosing to begin the vote, bribe a high level senator in the front row. Make absolutely sure he's on your side, then begin the vote. After the vote fails, choose to persuade by force and take a bunch of characters with long Throw distances into the battle. Rather than having to fight off a ton of senators, you can simply throw them onto your mole in the front row! So long as the level of the senator you're throwing is less than the senator doing the catching you'll be fine, and after throwing a couple of senators at the mole, the combined levels will be so high that you won't need to worry about levels at all.

Repeat this process until all of the opposing senators are gone, and you avoid having to fight any of them. This is an excellent, cheap way to unlock a lot of bills well before you should be able to do so.