Maybe because there is more than just gay marriage and abortion involved in an election. Not to mention while I might not participate in either of those activities to legislate christian morality among secular people is a quick way to get christians on an even more hated/undesirables list.
You don't like abortions or gay marriages then don't have one. Lost people are going to do what lost people and denying them rights based on sexual preferences is just wrong, and people get abortions whether or not they are legal, so having safe places they can go is better than back alleys, not to mention I think they are at worth consideration in cases of rape, incest, or when carrying to term could harm or possibly kill the mother.
Cases of abortion due to rape,incest or medical reasons are very low.Reasons listed below according to guttmacher.org
Having a baby would dramatically change my life 78%
Would interfere with education 38%
Would interfere with job/employment/career 38%
Have other children or dependents 32%
Can’t afford a baby now 73%
Unmarried 42 %
Student or planning to study 34%
Can’t afford the basic needs of life 23 % Unemployed 22 % Can’t leave job to take care of a baby 21%
Not enough support from husband or partner 14 %
Currently or temporarily on welfare or public assistance 8 %
Don’t want to be a single mother or having relationship problems 48%
Husband or partner wants me to have an abortion 14 %
Possible problems affecting the health of the fetus 13 %
Physical problem with my health 12 %
Parents want me to have an abortion 6 % Was a victim of rape 1% Became pregnant as a result of incest <0.5 %