Public financing. I know a lot of progressives see this as the holy grail. I’ve never been a huge fan, but regardless, we can’t afford it right now. The money simply is not there, so there’s not really much point in debating the merits.
Banning lobbyist contributions. Do you really think that these donations, which remember are limited to $200, are that much of a problem? Can $200 really buy that much influence? And even if you think it can, the Supreme Court has created significant constitutional obstacles to extremely low campaign contribution limits. I think it’s legally dubious, and it’s a band-aid at best.
Instant runoff voting, etc.. IRV and other ballot reforms would be great, but they are not going to solve the incumbency problem by themselves.