All political parties face a trade-off under a first-past-the-post electoral system. Governing depends on attracting a broad coalition of voters, inevitably involving compromises that leave a party’s base disgruntled.

So it is perhaps unsurprising that as we move closer to a general election, the discontent from the anti-Labour left who claim there is little to distinguish Keir Starmer from Rishi Sunak in the battle for the premiership is only getting noisier.

They have upped the ante in recent weeks. An umbrella campaign, “We Deserve Better”, that aims to unseat the shadow culture secretary, Thangam Debbonaire, and the shadow health secretary, Wes Streeting, among others, is channelling donations to Green and independent candidates, including none other than the former Labour leader Jeremy Corbyn.

The argument is threefold: there’s no meaningful difference between the Conservatives and Labour; Starmer supposedly can’t be trusted because he has dropped pledges he made in the 2020 leadership election to shift his party towards the centre; finally, the “Tories are toast” and Labour can’t lose, so disgruntled left voters can safely vote for other parties, such as the Greens.

With Labour so far ahead in the polls, the urge to debunk these sentiments may seem like an expression of paranoia. But all three aspects of this narrative are comprehensively wrong, including the reassurance that it is safe for anyone who would prefer a Labour government to vote for another party in Labour-Tory contests.

Amid a very positive set of results for Labour in the local and mayoral elections earlier this........

© The Guardian