The IPFW/Downs Center Poll almost has to be an outlier IMHO.
The design of it was 400 LV from 13 Apr to 27 Apr
They ended the day after the NE primary which was the week after the NY primary. IOW about half of their poll was when Cruz was high after Wisconsin and the media was playing his rules based wins from out west.
The other polls are a max of 3 days to get 4 to 6oo respondents. This one is 14 days to get their 400. I don’t like the design in a changeable thing like candidate support.