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He's hidden his more radical ideas to appear "electable"
It could mean his support actually grows in office, and becomes more popular.
These two points do not compute. The people of Britain don't want radical ideas, they've made that pretty clear. If Starmer starts introducing radical policies he'll get less popular and lose the next election so why would he do that?
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The people of Britain don't want radical ideas
Have they?
I think all the evidence is that they want the government to be more radical; to address climate change by moving to renewables, to focus on nature and the environment to stop it being trashed and to level set the economy so that everyone can benefit from it, not just a rich elite.
I'm interested to see how Starmer gets on now. He seems to have been elected by dint of not being a Tory (see below) and that means people may not actually have paid too much attention to what the policies are.
If we're doubly optimistic and suggest that:
It could mean his support actually grows in office, and becomes more popular.
The changes from 2019 to now show just how swayable voters are, and majorities mean less than they used to, so it's really important to build up the support base so good things might actually happen.