It's called a "schtick."
Kerry married the widow of a wealthy Heinz family heir, Republican Senator John Heinz, who died in a plane crash. Not one word has ever been said by them to condemn Senator Kerry for his wealthy wife trade-up.
Nancy Pelosi and her husband are wealthy beyond imagination, yet still, nothing is said as she manipulates laws around to benefit her family members with half billion and more in taxpayer-100% backed loans.
Not a word about Kennedy wealth was ever grieved, but a Republican who does well? They're putting pox on his house and squealing in unison the same balderdash they always pull out at election times. That's why we call it "Silly Season" when elections roll around. Libbies run contests on who can do silly better than the next.