Child Tax Credit enigma

Child tax credits seem to be popular with Democrats and Republicans alike. Biden's American Rescue Plan provided $3,000 to $3,600 per child for nearly all working families. This superseded the Trump's Tax Cuts and Jobs Act which provided only $2,000 per child and was non-refundable. However, this was still a significant tax break for many parents in a year which didn't offer many other middle-class deductions.

The Build Back Better Act would extend the 2021 Child Tax Credit into 2022. This seems entirely appropriate during a pandemic.

So, focusing on just his child tax credit position, how much support does Manchin really have from the right? Does he have ANY friends? Is it all about the refundable nature of these credits? Of all the hot-button political issues out there, this doesn't seem like much of a wedge issue to me. Am I missing something?