WILMINGTON, Del. (AP) - The Democrats’ historic boundary breakers, led by former President Barack Obama, joined forces Wednesday night at the party’s national convention, pleading for Joe Biden’s diverse coalition to put voting ahead of everything else this fall to save the nation from the chaotic leadership of President Donald Trump.Their overriding message: Don't just complain about Trump; vote because your lives and democracy itself may be at stake.RELATED: In Obama, Democrats see a bridge between Joe Biden and young votersIn remarks remarkable for their urgency and dismissiveness of a U.S.