A Question for my Republican Friends

Why do you support candidates and a party that supports this discrimination?  I know many Republicans who seem to have zero personal issues with gays and who have been personally supportive of my relationships; yet they give their votes and dollars to a political party that fights to deprive us of equality.  I am forced to conclude that they have made a calculation that the equality of their gay friends is less important to them than other issues.  Imagine if the shoe were on the other foot.  I can't imagine any of my straight friends remaining friends with me if I supported others who worked to to deny them equal rights and who devalued their relationships.