Sen. Barack Obama clinched the Democratic presidential nomination this week, so we’d be remiss if we did not revisit some of the many videos online that have popped up around the charismatic candidate that this column has referenced.

Tomorrow: McCain videos! Really!

First, the interview Walt Mossberg and I did last week at the sixth D: All Things Digital conference with News Corp. head Rupert Murdoch, in which he–in an unexpected move–appeared to be warming to Obama:

An Obama Girl attack on Sen. Hillary Clinton that I did not care for very much:

The super-cool Obama-”West Wing” mashup, which is totally coming true:

The very funny “Saturday Night Live” Obamapology:

And, of course, the mother of them all–the original Obama Girl video. Apparently, she has a crush on Obama:

So, as is BoomTown’s patriotic duty, I was watching the returns come in from Pennsylvania in the draggy war that has become the quest for the Democratic presidential candidate nomination between Sens. Hillary Clinton and Barack Obama, as I also pondered what would happen next in the even draggier Microsoft (MSFT)-Yahoo (YHOO) takeover battle.

Then a smart friend in the industry wrote me an email, stating the obvious:

This msft/yahoo deal reminds me of the democratic nomination. we all know how it’s going to end but it’s going to be nasty nasty nasty all the way till the end, with enough bitterness generated along the way to present a reasonably likelihood of a pyrrhic victory. the ultimate loser can only succeed in doing well enough to drag out the process and inflict more pain.”

My friend wins the pundit prize.

And, in other words, the only winners in both these ugly contests are obvious: Republican candidate Sen. John McCain and Google (GOOG).

Which are, ironically, the pair both other pairs should actually be most focused on defeating.