Owning a shotgun does not make him a friend of gun owners. I find it hard to believe that you really look at politics so simply.
There is a strong anti-gun lobby with the ultimate goal of eliminating guns in the hands of private citizens. They're trying to do it step by step, model by model, and state by state. One of their efforts in the last few years was to hold gun manufacturers liable for the actions of individuals who commit crimes with guns, essentially trying to bankrupt the gun industry. Kerry supported this effort in 2000 and 2004. Individually, Kerry's votes don't stop me from owning firearms. It's the potential sum of those votes that worry me.
England and Australia have already lost most of their firearms, including many hunting rifles and shotguns. The most popular shotguns for bird hunting in the U.S. are illegal under their laws.
The issue of children and guns is grossly exagerated by the anti-gun lobby. How many of the gun deaths they cite are from suicide, defensive situations, police shootings, or drug/gang related activity? For ideas on that thought, read THIS ARTICLE . While you're there, check out the link to the CDC statistics on causes of death and fiddle with the numbers and causes there.