To win the next election, the Tories need a left-leaning Lib Dem leader who can win over Labour voters in Tory-Labour marginals.
The Education Secretary "knows a thing or two about leadership ambitions", says Clegg on his LBC phone-in show.
No longer can David Cameron plausibly claim, if he ever could, that "there is no alternative".
An unlikely political alliance is formed as both men argue that health spending should not be protected while other services are cut.
Newly-released emails show that Vicky Pryce claimed to have told Vince Cable and others about the incident.
The PM and the Business Secretary are making diametrically opposed arguments on borrowing for growth.
Deputy PM comes to Cameron's aid and warns that borrowing for growth would risk a spike in interest rates.
After the Business Secretary's dramatic suggestion that the government should borrow for growth, the PM will denounce those who would "plunge us back into the abyss".
Business Secretary argues in the New Statesman for "greatly expanded" capital spending and suggests that the Chancellor should borrow for growth.