As for abortion, I'm simply against killing people for the purpose of making life easier for the person paying for the kill. I believe that people are responsible for their actions, and it's reasonable to assume you MAY create a life if you have sex, and therefore you are responsible for the life you create by choosing that action.
As for same-gendered unions, I'm all for anybody living the life they choose to live so long as it doesn't harm others. I see no inherent harm in two men, three women, two couples, whatever, all wanting to live together, share ceremonies and life experiences and bills and whatever. Leave their money to each other in their wills, have living wills for medical issues and hospital access, executor's of each other's wills, etc. The one and only difference between these groups and two opposite gendered people living together as "married" is the state marriage license/certificate. If that's defined as one man and one woman, so be it (it's worked well for thousands of years that way). If people choose to call same-gendered or multiple partner unions something to fit what they are, so be it - vote on it in your state and enforce that accordingly. But, just like we don't give a motorcycle license to someone to drive a semi, we don't give a marriage certificate to someone who doesn't meet that criteria.