Barack Obama can’t oppose same-sex marriage and allow already married couples to keep their licenses, as one liberal pundit suggests, since taking those stances would make Obama inconsistent on what constitutes unjust discrimination, writes Ramesh Ponnuru. While Obama overstates his role in passing the Illinois earned income tax credit in a new ad, he deserves some credit since he played a key role in moving it through the state legislature, a reader writes to Yuval Levin.