There is if you grant a straight couple that right...and since we do, it becomes a right that any two consenting adults are entitled to.
No.. there is no 'right to marry'... PERIOD....
Hell.. the govt should be out of the marriage business all together
If 2 guys or 2 girls wish to live together as a family unit and file taxes together and have inheritance rights or whatever other LEGAL equality... all well and good.... but there is no 'right to marry' and the
government does not exist to force churches or states or citizens to recognize 2 men or 2 women as 'married'... just as there is no 'right' to marry your sibling