@cecilia, I happily accept that you and I have different viewpoints. You're a liberal, I'm a conservative.
What I don't think you get is that no one, not a single choice for President -- no matter who's ultimately elected -- can actually change anything for the better. You can blame the President. You can blame Congress. You can blame voters, or really, anyone you like, but the simple fact is that the system is broken.
The only way Bernie, or anyone else can do anything at all is by executive orders bypassing Congress, and side-stepping the U.S. Constitution. We all see how well that's turned out under King Obama. The only exception to that rule is if Congress and the Presidency are all same party, and that's a horrible thing (historically) for the people of the United States regardless of which party. A unified 2/3s of the government means there are literally, physically, bureaucratically ZERO checks and balances, and that is always (again, historically) when the worst shit for the American citizen gets walked through into law...
So, given that the President can only be a puppet, or a dictator who can't actually do anything without bypassing the U.S. Constitution, I can only fall back to the principles that I choose to support. Bernie's self-appointed Socialism simply goes against everything I believe in, from my core...
I do hope that in the end, it comes down to a Bernie versus Trump fight (it won't, the DNC will never allow Bernie to get the nod). If it does, who I vote for becomes a much harder thing for me. The idea of a Trump Presidency scares the hell out of me, so the question becomes, do I accept the fear (Trump), or do I vote against my conscience (for Bernie)..?