Possible to switch credentials mid-playbook?

Hello,

Is there a way to instruct ansible to use a different username/password combinations for a tasks or plays within a playbook? I see the remote_user variable, but do not see an accompanying remote_pass variable. I need something like ansible_ssh_user and ansible_ssh_pass to be definable per-task or per-play. The problem I’m trying to solve is with a distro that has a default username/password that I want to replace with a different username/password, and then continue executing roles/plays with the new username/password. Thanks in advance!

-bw