I’m not certain what model of muzzle loader that is/was but I don’t think it was a rifle.
It looks like a “Hawken” style, such as is available from Traditions, Pedersoli, Thompson-Center or a variety of other manufacturers. It’s definitely a rifle.
“...but I don’t think it was a rifle...”
Well, it appears to be a percussion lockplate, rather than a flintlock - I blew up the picture as much as it will go before it pixelates and distorts. I don’t see the frizzen or flash pan on it.
It looks a bit like one of my Hawken rifles, but the barrel does not appear to be octagonal.
Either way... if he wanted to make a REAL statement - and grow his flagging political stature - he should have brought an American-made AR15 Homeland Defense Rifle.
No guts, no glory...