Cboldt, check again. You may be right and I may have misread it, but I thought the 160 number included dem crossovers and independents.
Here’s what it says at the bottom:
Sample Size: 400 completed telephone interviews among a random sample of likely Republican primary voters living in Wisconsin (240 self-reported Republicans and 160 self-reported independents and Democrats.
I just checked, and you are correct, my mistake. The 160 does include DEM.