Trump, Sanders and key figures from both presidential campaigns hit the shows.
A group of delegates are pushing to eliminate superdelegates.
Kaine spoke in favor of the trade deal just days ago.
Kaine has praised the trade deal as recently as last week.
Clinton's search reportedly focused on Kaine, Vilsack and Hickenlooper.
"People in Ohio want to see a positive agenda, a positive way to move forward."
Clinton and Kaine make their first joint appearance in Miami.
"You just can't find anyone with a bad thing to say about him," the president said.
The PCCC said Kaine's TPP support will create a "new opening to attack Democrats."
Loretta Sanchez noted Obama and Kamala Harris are both black.