Good question; not an easy one to answer.
Since I've always had empathy for the underdog I have been a registered Democrat since I first voted in the presidential election in 1968. I have voted for the Democratic nominee in all presidential elections but for 1980. That year, knowing Carter was cooked, I voted for John Anderson (a Republican turned independent).
In my life I'm a fiscal conservative; I don't spend more than I earn and paid myself first (great advice I received early in my career) by saving 5% of my net income from every check. My wife and I don't carry credit card debt, we pay the bills in full each month. Of course when we needed a roof I borrowed the money; not to do so and risk great damage and greater costs down the road makes sense. This differentiates me from those who claim fiscal conservative values yet don't have the sense to realize the consequences of deferred maintenance.
I support policies which are pragmatic and provide the greatest good to the greatest number; a party which respects the rights of the individual, both those with power and those without; a party that administers laws fairly, balancing the needs of the many with the needs of the individual - not an easy task in even the best of times.
I support a party which is a competent and visionary steward of our environment, protects our air and water, promotes the sciences in the never ending quest for knowledge and recognizes the potential in every citizen notwithstanding their race, color, gender, creed or sexual orientation.
I support a party which is honest in its mission and able to offer citizens a clear, unambiguous course, understandable to most of the people all of the time; a party not afraid to admit mistakes and able to adjust course when events dictate, and always open to the vetting of new ideas in the public domain.