I voted for a Democrat once, Ted Strickland for Governor of Ohio, for the most part due to his strong support for the 2nd Amendment (his Republican opponent was a gun-grabber). He was fairly moderate and made good on his promise to pass concealed carry legislation. Of course, when he later ran for US Senate, that went out the window and he became a hard lefty.
I will never again vote for a Democrat. No matter what a candidate says his beliefs are, in the end they will most often support whatever their party wants. For that reason, it matters what party holds the majority. The majority party controls what legislation moves, controls committee appointments, approves or blocks judicial appointments. The Democrat machine is bent on destroying America, they have to be prevented from having the power to lead us down that path, even if it means voting for a scummy RINO in the general election.
