Blinken was followed by Secretary Alejandro Mayorkas and US Attorney General Merrick Garland and US Ambassador to Mexico Ken Salazar in attempting to mend America's troublesome relations with Mexico.
As officials from the two nations worked hashed out a new security cooperation accord and handled a surge in migration across the border, Harris was nowhere to be noticed.
Harris was particularly slammed for her failure to visit the border to view the state of affairs for herself.
She eventually yielded to pressure and visited the border at El Paso, Texas, in June. It is the only time she's been to the border since taking office.
On her New Jersey day trip, Harris visited the Ben Samuels Child Care Center at Montclair State University in Little Falls where she met with students and teachers.
The vice president, who was accompanied by Governor Phil Murphy and Congresswoman Mikie Sherrill, stopped by some classrooms to meet kids and joined in with a game of shape bingo.
She then met a group of educators for a roundtable concerning the value of supporting working parents.
The vice president seemed to have worked up an appetite as she then stopped by cake shop Tonnie's Minis where she was joined by Senator Cory Booker.
Harris bought red velvet cupcakes and slices of carrot, pineapple coconut, and chocolate-covered sponge cake.
In the meantime, Blinken was taken on a mural tour of the National Palace by Lopez Obrador before the two delegations had a working breakfast.
They were joined at the crisis meeting by Garland, Salazar, Mexican Foreign Minister Marcelo Ebrard, and Secretary of Public Security and Citizen Protection of Mexico Rosa Icela Rodriguez.
Blinken announced that Lopez Obrador's earlier remarks were "exactly in line" with what Biden has in mind for the US-Mexico relationship.