Because he wants power and the only way he could get a sniff was by reneging.
That's at least looks like an answer, but I'm still left with so many questions (I am not being sarcastic, I am literally stupid with regard to how other people think).
When you say he did this to gain power (make promises - win votes - forget promises - take power) - what do you think would drive someone to do such a thing - and for what - to become reviled by your electorate, by your party, to risk becoming (possibly) unelectable (?) to (possibly) damage your party ?
And what power did he gain, the power to compromise on core values ?
That's at least looks like an answer, but I'm still left with so many questions (I am not being sarcastic, I am literally stupid with regard to how other people think).
When you say he did this to gain power (make promises - win votes - forget promises - take power) - what do you think would drive someone to do such a thing - and for what - to become reviled by your electorate, by your party, to risk becoming (possibly) unelectable (?) to (possibly) damage your party ?
And what power did he gain, the power to compromise on core values ?