I guess since McCain died, she has no other way to stay relevant, so there's no surprise here in this "endorsement".
From Wikipedia:
"Cindy Lou Who Hensley McCain (born May 20, 1954) widow of Senator John S. McCain III (R-AZ) is an American businesswoman, philanthropist, and humanitarian, and the mother of television host and commentator Meghan McCain (and 3 sons, as well). She was college edumacated and was a special education teacher who made her own contributions in that field (I give credit where credit is due.)
But she basically was the rich only child of the wealthy beer distributor James Hensley and she did whatever she wanted, whomever she wanted, and inherited the sizable fortune which has afforded her to do whatever the heck she's wanted her whole life.
John McCain’s widow Cindy endorses Biden for president
Cindy McCain, the widow of former Republican Senator John McCain, said in a statement Tuesday that she will back Joe Biden for president. In the statement released on Twitter, Cindy wrote Biden is …
nypost.com