I'm Canadian so my concerns will be a little different from most of what the US-ians on here will be concerned about. (ie - I am fortunate enough to not have to worry about openly being queer in the military, equal marriage, or health care). So, that being said:
My main concerns are 1 - making public transit more efficient, more accessible, more available, and more....attractive to people. And 2 - making green sources of energy more affordable and available to the average homeowner.
EDIT - I do get that the question was specific to the US and your elections. But I felt like talking about my stuff too.