McCain, Obama campaigns spend Thursday fighting over the Supreme Court's landmark gun ruling.
McCain team circulates to reporters "a simple question:" Read release here.
Obama denies earlier attack that he has flip-flopped on D.C.'s gun battle.
Tells Pennsylvania TV station: "I don't know what my aide said but I've been very consistent... I think we can move beyond some of the conflicts on this issue."
Earlier: On McCain conference call, GOP-backers say Obama changed his position on D.C.'s gun ban as well as FISA, NAFTA and campaign finance. Listen to the call here.
