except not only did he NOT see it, but his dad, George Romney, didn't do it.  From MSNBC.

Romney says that it depends on what the definition of "saw" is. 

A defensive Romney was peppered with questions today on exactly what he meant when he said -- most recently on Meet the Press -- that he "saw" his father march with Martin Luther King Jr. Recent articles have indicated that his father, the late Michigan Gov. George Romney, didn't march with the civil-rights leader.

Admitting that he didn't see the march with his own eyes, he said, "I 'saw' him in the figurative sense."

"The reference of seeing my father lead in civil rights," he said, "and seeing my father march with Martin Luther King is in the sense of this figurative awareness of and recognition of his leadership."

"I've tried to be as accurate as I can be," he continued, smiling firmly. "If you look at the literature or look at the dictionary, the term 'saw' includes being aware of -- in the sense I've described."

Gee. I guess I marched with Martin Luther King, too! And you.. and you.. and you!

P.S. Article points out also that although he said was endorsed by the NRA... he wasn't.