In the years after his exit from the Foreign Office, and particularly following his resignation from the Cabinet, Cook made up with Gordon Brown after decades of personal animosity — an unlikely reconciliation after a mediation attempt by Frank Dobson in the early 1990s had seen Dobson conclude (to John Smith) "You're right. They hate each other." Cook and Brown focused on their common political ground, discussing how to firmly entrench progressive politics after the exit of Tony Blair. Chris Smith said in 2005 that in recent years Cook had been setting out a vision of "libertarian, democratic socialism that was beginning to break the sometimes sterile boundaries of 'old' and 'New' Labour labels". With Blair's popularity waning, Cook campaigned vigorously in the run-up to the 2005 general election to persuade Labour doubters to remain with the party.