I won't be voting for Hillary Clinton if she wins the Democratic Party nomination for president, and I won't heed Bernie Sanders if, as he has vowed to do, he calls on his supporters to "come together" after the convention, should he lose, to support Clinton and prevent Donald Trump or another Republican from becoming president.
Hillary Clinton on her best days is still a serious menace to both the earth's continuance as a habitable planet, and to peace. A committed neoliberal who has pursued, both as a senator and as a secretary of state, a policy of economic and military destabilization of sovereign governments, with no regard for the aftermath of such criminality (think Iraq, Afghanistan, Somalia, Venezuela, Libya, Ukraine and Ukraine, but especially Libya, Ukraine and Honduras, which were very much her doing in her last public position as secretary of state), Clinton has made it clear even on the campaign trail that she considers Russia to be an enemy. If elected, she has made it clear she'll continue a dangerous policy of brinksmanship, pushing for NATO membership of more nations bordering Russia, and moving offensive weapons and troops there too. The stated neoliberal (and neoconservative) goal is to ultimately destabilize Russia so that a) President Putin is removed, and b) so that Russia further fragments into smaller nation-states. This is a mad recipe for World War III, and Clinton, as a new president out to prove her toughness, is a good bet to push things to a point where that war could become a reality.
She would, as president, also continue the long-time US policy of destabilization of elected governments in Latin America, and, in the Middle East, the abject and unqualified support of the virtually fascist government in Israel, as well as of the islamo-fascist arab regimes like Egypt, Saudi Arabia and Kuwait -- all of which she supported as a senator, and helped facilitate as Obama's first secretary of state.
A supporter of fracking and of oil exploration, and even of the coal industry, all of which industries are funding her campaign, she will not take any consequential action to combat global warming that would threaten those industries. If she took the issue seriously, why would so many of the top "bundlers" of PAC contributions to her campaign be lobbyists from the energy industry?
If the rule is, judge a woman by who her friends are, let's look at Clinton's friends. So how about this rogue's gallery: Henry Kissinger, one of the greatest US war criminals of the post-WWII era, arch-neocon Richard Kagan, a co-founder of the notorious Project for a New American Century (the playbook for the Bush/Cheney administration's invasion of Iraq and demonization of Syria and Iran)...