With good cause, Mr Clegg and his party are passionate advocates of pluralist politics. The Coalition has been an experiment in pluralism that is rare in British history. But even worthwhile experiments have their limits and it must be increasingly clear to many Liberal Democrats that they have gone well beyond them.
There are obviously huge risks for the party if they pull out of the Coalition, and some for the country, too. In such circumstances, Mr Cameron might call an early election, win a majority and lead an even more Eurosceptic government. But in the light of recent events, the risks for party and country of sustaining the Coalition are greater.
Liberal Democrats must consider whether remaining partners with the most Eurosceptic Prime Minister in the EU is not more damaging both for them and the country than the option of walking away.
Amen to that, says Malcolm.