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02.25.12 9:45 AM ET

Marie Colvin’s Final Interview, Obama Sings Again, More Viral Videos

From a ‘Linsane’ sketch on SNL to Kevin Costner’s touching farewell to Whitney Houston and Romney’s intense love for Michigan, see our countdown of the week’s buzziest videos.

10. ‘Is This Dude Serious?’

In his latest campaign ad, Ron Paul questions just how fiscally conservative Rick Santorum really is.

9. When Colbert Met the Donald

Stephen Colbert was back on the airwaves Monday and wasted no time sharing details from his latest celebrity encounter. A picture truly is worth a thousand words.

8. Romney Really, Really Loves Michigan

The trees are just the right height, the lakes come in all different sizes, and the cars are American! What’s not to love?

7. Jimmy Fallon’s Ode to Jeremy Lin

Who knew that a famous Pearl Jam song would become part of Linsanity? Watch as Fallon performs “Jeremy (Lin)” in honor of the sports phenom.

6. Obama to Detroit:  I Didn’t Let You Go Bankrupt

The president’s new Michigan ad highlights Mitt Romney’s opposition to the auto bailout, noting that Obama didn’t bet against the industry.

5. Linsanity Invades Saturday Night Live

How many Jeremy Lin puns can fit into a single sketch? Let’s just say SNL managed plenty in a spoof on the racist reporting surrounding the Knicks’ newest star.

4. Did Culture Wars Win the Debate?

Where’s the culture wars' latest battleground? Try the CNN stage at Wednesday’s Arizona debate. When Rick Santorum and Mitt Romney weren’t fighting each other, they doubled down on their views on contraception.

3. Slain U.S. Journalist’s Final Interview

Shortly before she was killed in a shelling attack in Homs, Syria, journalist Marie Colvin spoke to Anderson Cooper on Tuesday about the horrific violence she witnessed at the hands of Syrian President Bashar al-Assad’s regime.

2. Obama Sings Again

President Obama is going to start getting requests at press conferences. After singing a bit of Al Green’s “Let’s Stay Together” at a fundraiser last month, Obama sang a few lines of “Sweet Home Chicago” at a White House music event with Mick Jagger, B.B. King, and others.

1. Kevin Costner’s Emotional Speech

Whitney Houston’s Bodyguard co-star fought back tears as he remembered a beautiful and innocent Whitney and her dreams of success.