If only this Coalition Government were poll-driven or focus-group driven, the past week's idiocy, indeed, the past four-years' idiocy, would not have happened.

These days, there is only one poll that counts, and that is the poll for leadership within the party room.

If Turnbull had led his government rather than let the right-wing of his party lead him, the vote on marriage-equality this week could easily have gone the other way, approving a conscience vote without a plebiscite, whether at polling stations or by post.

Look at the numbers. There are 28 ministers and 12 parliamentary secretaries in the Parliament. Six of them are Nationals, leaving 34 members of the 81 members of the Liberal partyroom in the Government. Add to them the seven so-called defectors and you have 41 votes in the partyroom. That is a bare majority, but once many of the others had seen the way the vote was going, they, too, would have voted for a conscience vote without a plebiscite.

Turnbull could have easily argued that the election promise of a plebiscite has been met by the Coalition, but defeated by the Senate so out of the Coalition's control. He could have further argued that Coalition Prime Minister at the time of the formulation of the plebiscite policy during the previous term, Tony Abbott, had said that that parliament would be the last one in which marriage equality would not be a conscience vote. Turnbull could have argued that that promise should be honoured.

With a bit of effort, the numbers were there and this issue would have been squared away so that by election time people would have been wondering what all the fuss was about.

Aside from the human rights and equality questions, clearing the air was one political reason for doing the conscience vote now. Another reason is that marriage-equality, like climate change, evolution, the spherical earth and the heliocentric solar system, is a "valve" question.

By "valve" question, I mean that the direction of opinion only moves one way. Over the past few months we have seen, time and time again, people declaring that they now agree with marriage equality and what made them change their minds. There have been no declarations the other way.

Similarly, people who realise that climate change is real and we are causing it, do not go back the other way. When people see the truth of evolution, the round earth and the fact that it goes around the sun, not the other way, they do not go back.

In short, marriage equality is going to happen, so why let a few conservatives fight a rearguard action of disruptive delaying tactics. Barring the High Court permitting unlegislated spending for a postal vote which does not get boycotted, it seems likely that Labor will get the credit for the change.

This brings us back to the pity that political parties do not go back to being focus-group driven.

Results from the Fairfax Media Ipsos focus-group published in the past week painted the Turnbull Government as a "do nothing" Government. People interviewed by-and-large could not cite one single thing the Government had done to help them.

A couple mentioned the Home Affairs super-ministry, but in negative terms. The focus groups were seeing through the Government exaggeration over the threat of terrorism.

If the focus-groups are saying Turnbull is a disappointing, do-nothing, non-achiever, surely he should do something about it rather than continuing with the policy that the partyroom leadership vote is the only poll that counts.

Why reinforce the notion that if you want to get something done in Australia, you have to rely on Labor: the Snowy Mountains scheme; national pharmaceutical and health schemes; national disability scheme; financial deregulation; the Great Barrier Reef Marine Park; saving the Franklin etc etc?

The lead-up to the partyroom vote was like a cheap thriller movie – the music goes up in pitch and goes staccato. Don't stay where you are! You are in danger! You have to move or you will be caught!

But it did not end up like a cheap thriller with the hero moving out of harm's way. No, this time the ogres got him.

So what now? Several people have put their hands up to conduct a High Court challenge. The court most likely will demand undertakings from the Government not to conduct a postal plebiscite until the matter is heard.

It may be that the Government gets away with the vote being conducted by the Australian Bureau of Statistics as "gathering statistical information" which is already legislated for, but there will certainly be delay and friction.

This is what the delaying conservatives want. The process is now stacked. Marriage equality requires two "yes" votes – in the postal vote and in the Parliament. The status quo requires just one vote.

The postal vote could easily lose because it is voluntary and young people are less engaged, particularly if the vote is not online.

And what if the turnout is low, say below 50 percent because of a boycott or lack of engagement, and the result a very close "no" victory? It will carry little legitimacy, particularly as more accurate statistical sampling measures are available for gauging opinion on the matter.

It will rightly be seen as a waste of money caused by the so-called fiscally responsible Liberal Party.

And then it will be up to Labor to get the measure through, because opinion is inexorably going through the valve in one direction.

Usually, good politics makes bad policy. On this one, the politics are as bad as the policy. If it cannot lead, the Liberal Party should at least follow opinion polling and focus groups.

www.crispinhull.com.au