Hillary lost because she presumed she had certain states in her pocket and didn’t do the work.
Via Politico:
Everybody could see Hillary Clinton was cooked in Iowa. So when, a week-and-a-half out, the Service Employees International Union started hearing anxiety out of Michigan, union officials decided to reroute their volunteers, giving a desperate team on the ground around Detroit some hope.
They started prepping meals and organizing hotel rooms.
SEIU — which had wanted to go to Michigan from the beginning, but been ordered not to — dialed Clinton’s top campaign aides to tell them about the new plan. According to several people familiar with the call, Brooklyn was furious.
Turn that bus around, the Clinton team ordered SEIU. Those volunteers needed to stay in Iowa to fool Donald Trump into competing there, not drive to Michigan, where the Democrat’s models projected a 5-point win through the morning of Election Day.