The question Why are "third parties" viable in many democracies but not the USA? ask why third parties don't win seats in US. The answer is simple. US got winner takes all attitude election system.
Based on that, I would think that any countries with different election system than the United States would have been more representative.
This is what I would expect:
Political parties want to maximize number of seats . So if 20% of people wants subsidies for peanut farmers, and no political parties advocate that yet, then the one political party that favor it will easily get 20% votes from the peanuts voting bloc.
I would expect 20% of the senators/representatives to have peanut farmers agenda. Whether their wish become laws would be another issue. But at least the issue will be talked about and used as bargaining chips for other things.
You can replace peanuts farmers with libertarian, liberal, gay, statists, conservatives, etc.
In fact, if the word representative means anything, any issue that is supported by X% of the population should also be represented by X% of their "representatives"
There are 560 members of DPR in Indonesia for example. So any issues supported by 1/560=.2% Indonesian population should have at least 1 DPR member that count on it.
However, in the real world, this usually does not seem to be the case, Some samples of issues that I think is under represented in Indonesia, for example, are:
- Porn legalization
- More freedom of speech. Currently some radical groups can pretend they get offended and jail some very popular governor.
- Legalization of drugs.
- Citizen dividend
- Replacing income taxes with land taxes? I mean. C'mon. Most Indonesians are workers, not land owners. Surely they love the switch.
Each of this issue is supported by 10%-70% of Indonesians I think. Not many I know. But it's not even talked about. Population that wants those issues done do not have any party to pick. That is far more than our .2% threshold. Yet no body campaign on those issues.