The government absolutely has and takes the responsibility to tell us how to live. While we have certain rights, (and even some of those aren't rights anymore), there exist privledges. Of those is 'marrige'...Driving...hrm...Seat belt or helmet laws, etc...things like that.
The Gov't is well within its rights to set down restrictions for those things. Let the people decide.
re: Homosexuality, etc...
Sin is sin. Homosexuality hurts people physically and emotionally. One data point that proves that is the life-expectency of those who choose that lifestyle. There are other data points; domestic violence rates, etc, which corroborate the distructive nature of the lifestyle. The man in the video is spot-on-correct to compare homosexuality with incest and pedofilia - at least in terms of sinfulness...although I don't know the bible speaks specificially of incest.
“… the greatest detractor from high performance is fear: fear that you are not prepared, fear that you are in over your head, fear that you are not worthy, and ultimately, fear of failure. If you can eliminate that fear—not through arrogance or just wishing difficulties away, but through hard work and preparation—you will put yourself in an incredibly powerful position to take on the challenges you face" - Pete Carroll.