Is it any different here? Rudy Giuliani received communion from the Pope when he was in New York in 2008 and I’m not aware of anyone who has denied Newt Gingrich communion. It doesn’t seem to be enforced as a matter of policy in the U.S.
Newt’s previous marriages have been canonically resolved, Rudy’s previous marriage has not been. Rudy was probably married sacramentally, Newt was not until Callista. Different people, different circumstances.