Sen. JD Vance has not had much of a honeymoon.

In his first week on the campaign trail as Donald Trump’s running mate, the Ohio Republican had to compete for attention with a shakeup atop the Democratic ticket: President Joe Biden’s exit and Vice President Kamala Harris’ elevation as the de facto nominee.

Much of the buzz surrounding Vance has ranged from distracting to unflattering. Progressives pounced on his nearly three-year-old comments about “childless cat ladies” — a…