1. Those who wish to see the right leader for their state and country, regardless of race/religion.
2. Those who wish to keep the status quo in the country and maintain the current Federal government with some slight reforms.
3. Those who have little care for the country's political future and who are most vulnerable to "bribes" and short-term incentives to vote for a particular candidate/party.
The whole nation (as well as foreign nationals concerned about Malaysia's future) can take part in the PP election indirectly by praying to God that the PP election will be fair and that the voters will be of the first category.
If all sincere Christians, Muslims, Buddhists and Hindus (all over the world) were all to pray to God in their own ways for a fair and just election, and for the voters to choose the right leader in Permatang Pauh, then this act will be more powerful than all the sms, all the rallies, all the blogs, all the money that can be used to persuade the voters.
Malaysia needs a real change of leadership. Either the current leaders change their attitudes and value systems (which seems unlikely given recent events and policy errors), or the government has to change.
The Permatang Pauh election will be the second major test of Pakatan Rakyat and Anwar Ibrahim's political and moral credibility after their relative victories in the 8 March election.