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Vacillate: verb - sway or swing unsteadily; in unstable equilibrium, oscillate, stagger, vary, fluctuate; waver between different opinions, options, actions; indecisive.
'There is a perception, amongst those of a fixed political view, that the Liberal Democrats vacillate on most points of policy; this is false, of course, as they merely tend to take the middle path, rather than either of the offered extremes in most things.'
25 October 1961 Private Eye was published for the first time. I doubt Ian Hislop, the current editor, was even around at that time. It’s been responsible for deflating many a political and celebrity ego along the way. Long may it continue to do so.