While introducing his candidate Clinton at the AFL-CIO's Building Trades National Legislative Conference, the Pennsylvania Rep. says McCain is too old to be commander in chief.
Murtha, 75, tells union audience that rigors of the job are too much for men in their 70s.
Plus: In speech, Clinton says McCain is "dead wrong on all the important issues facing America."
McCain responds to Murtha with a laugh on MSNBC.
"Campaign with me, and you'll see the reason why I'm the nominee of my party is because we out-campaigned everybody."
