Well as a gun owner in a state that is very very hard on guns, a democrat and Obama supporter I can weigh in here.
I'll say that I have several guns that are 'regulated' so I had to jump through some hoops but I didn't mind at all - I'm not a psycho and if I want to go on an elk hunt I plan it out - so I don't mind waiting periods, background checks etc.
Unfortunately you have an uphill climb - McCain doesn't like guns. Look here at gun owners of America: http://www.gunowners.org/mccaintb.htm
He's got crap ratings.
John McCain is a political panderer that will talk a good game but when you look at his record, he's shown to be the liar.
In my opinion - pick another topic - if your adversary looks at this stuff he's going to congratulate you for agreeing with him on most issues.