Will The 2020 Democrats Reject Obama’s Immigration Legacy?

With Joe Biden on the debate stage Wednesday night, the other Democratic primary candidates will have another chance to criticize elements of his long political record. But Biden’s presence — and his wholehearted embrace of his time as second-in-command during the “Obama-Biden administration” — also creates an opportunity for his rivals to take on President Obama’s legacy, particularly on policies like immigration.

We’ve already seen a preview of what this might look like. In the first debate, Kamala Harris criticized a deportation program that operated for much of Obama’s presidency...