how is it moving goal posts. gp's response as i understood is that this has something to do with 'riling up' which makes it 'populism' ( vs democracy) . I am as

how is it moving goal posts. gp's response as i understood is that this has something to do with 'riling up' which makes it 'populism' ( vs democracy) . I am asking where they got there was any 'riling up' involved in this case. I guess i don't really understand 'riling up' means.