This is from last year, but it shows the problems that Democrats have saddled themselves with with Perez. Ellison was far left, but Perez is not much better.
Via Free Beacon:
Politico reported on Monday that many influential Democrats are floating Labor Secretary Thomas Perez as a possible running mate for Hillary Clinton, despite his history of scandals.
Perez endorsed Clinton in December and has campaigned for her in recent weeks. Political insiders speculate that Perez would help Clinton shore up portions of the liberal base that she has lost to her socialist rival, Sen. Bernie Sanders (I., Vt.), in nearly half of the primaries. Perez would also bring diversity to the ticket, since both Clinton and Sanders are elderly white people.