First off, proliferation of guns has very little to nothing to do with violent crime rates. Violent crime rates have been steadily decreasing since the 1980s(there was a spike in the early 90s) and there is no correlating effect between implemented gun laws between that time and now. Draconian anti-gun measures are proposed based solely upon emotional appeal to the lemmings, and not on facts and logic(many of these facts and logic do not correlate with politicians' "truths"). Correlation does not equal causality. There are many hundreds of factors as to why gun violence increases/decreases, and the actual truths of it are going to severely upset many people's firmly held beliefs.
The Virginia Tech shooter had a Glock and Walther P22 with magazine capacities of 10 and 15, along with a myriad of other blunt object weapons. So in what way would a law requiring magazines holding no more than 8 rounds do to prevent the 35 deaths at this massacre? A bad guy intent on doing something like this cannot somehow obtain magazines that hold more than 8 rounds? A bad guy, even if confined to 8 round magazines, cannot simply carry a few more on his person. A bad guy, cannot swap out a new magazine in a second(I, for one, can swap in a fresh mag in my 9mm in about that time, easy)?
Anyway, gay marriage....gets attention because there is big money behind the gay lobby. Lets forget the civil rights of others.