Champion

1. To support something wholeheartedly; to actively encourage something; to back an idea, event, person(s) or thing; to be an ally for a cause.

2. Love something a lot.

"I champion their relationship"
"She champions the idea of you buying a cat"
"They champion this community"
"Do you champion his new hair-do?"
"She used to champion this band, but she doesn't like their latest records."