When Lord Oakeshott told me he was resigning at lunchtime today, it was clear the breakdown in relations with his "old friend" Vince Cable played a critical part in his decision to quit.
Lord Oakeshott resigns from Libdems saying party is "heading for disaster" with Nick Clegg as leader
Yesterday, the Business Secretary effectively cut him loose with a statement saying the Liberal Democrat peer's actions, leaking damaging polls to the Guardian, were "totally inexcusable".
This is very damaging indeed as it suggests - despite insisting yesterday "there is no leadership issue", the Business Secretary may, after all, have been involved in plotting to unseat Nick Clegg.
Vince Cable, who's in China, has yet to comment on the claims.
For years, Lord Oakeshott has made no secret of the fact he believes Nick Clegg is hindering not helping the party's prospects. But his suggestion, in his resignation statement, that the party is "heading for disaster" under Mr Clegg's leadership is likely to lead to more turmoil in the party's ranks over the coming days.
"A busted flush" is how one senior source described Lord Oakeshott to me, but that may turn out to be wishful thinking.