Some have to be asked right, Immigration and the migrant camps is so prevalent in the consciousness right now you cant escape asking what they will do about it. I think Buttigeg will get hit with the issues in South Bend right now in relation to the larger issue of how the candidates appeal to minorities and get traction with the constituency any one of them will need to win the nomination and election at large.
I'm predicting Harris will do well. Biden will just have to weather the punches really and still retain his popularity. Sanders needs a commanding performance too.