"claimed" is the right word.

As noted by others, there is precisely zero proof that the caption "Obama uses cluster bombs on civilians..." has any validity whatsoever.

Anybody who would accept this video as proof of what the poster of the video says only shows his or her gullibility.

Gee, I wonder if the poster---and anybody who believes it--is left of center.

Do leftists ever do research?    Sometimes it seems unlikely they do.

They are great at smearing.    Not so wonderful at anything else.