This is the Blairite campaign slogan is, but it is nonsense.
For a start, Labour under his leadership have opposed the Government far more, and far more successfully, than Miliband did or a shadow Opposition run by any of the other 2015 candidates would have. Secondly, we have just had a major referendum in which Corbyn's long-held position (rather than the one the PLP made him take) received more votes than those of the Blairites - and yet he is apparently the one that is out of touch. Then you have the evidence of what they did when they were in power - agency Labour, privatization, pro-big business, PFI, toleration of tax avoidance; they are not going to be coming up with things that are good for the country. Finally you have the most troubling of their beliefs, that he isn't "a leader" - which in this context means that he is not willing to lie to the electorate.