Ew, more mushy old people. Old people politicians
this time, no less. I will break you guys.
I believe I've gone on about this relationship before
An excellent metaphor for these two is the moon and sea. Diana is endlessly patient, calm, the unwavering light in dark. Of course she loves her man, but she could get along without him, as she did before. Cornelius is about as moody, irritable, and unforgiving as your average ocean, with that sort of majesty and sort of bleakness. After The Incident, he needed someone to take hold of his choppy life and impose exactly the sort of soothing rhythm Diana offers. He ebbs immediately from cold and strung-out to smiley and pacific under her influence. She straightens out his days. Losing her would be disastrous. Possibly fatal.
Because it gets asked as well, Cornelius and Diana are one of those couples that seem to be perennially engaged. These people are so damn busy. At first they were worried marriage between a senator and a representative from separate parties might be kind of bad for their careers. But silly them. Their colleagues, and the press, are more concerned that they're living together part-time and not married. It happens, eventually.
Also, do they get crap about Cornelius' glatnism? You betcha. On one terrible occasion Diana was accused of bestiality, and you can imagine Cornelius unleashed the motherloving wrath of god on the slanderers. They've been, publicly, left alone after that. Diana shrugs off the ignorance, but incendiary commentary on the state of his humanity will always be a live wire for Cornelius.
Might keep doing these couple portraits, though it occurs to me I don't have very many more couples in my cast...