Why is Hillary Clinton running for office?
For the same reasons every other multi-millionaire/billionaire runs. They're interested in acquiring power and having a historical legacy.
Why is she being Supported through these despicable actions?
Mainly because people vote according to their pocketbook, the party platform, and promises made. Personality also trumps character.
It also probably doesn't hurt that she's married to the most popular living former president at this time. A lot of people love Bill Clinton more than they love Hilary. They may be feeling a vote for Hil is a vote for Bill. LOL!
Seriously a lot of folks remember the 90s as being an economic boom. Per an ABC news report:
"The fiscal 2001 budget surplus was projected at $256 billion, White House officials said. The fiscal 2000 surplus was $237 billion, officials said, which capped four straight years of budget surpluses. This was the first time the country has had four straight budget surpluses since 1930, officials said."
It sure beats the deficits we face today.