We realize there's only so much time one can spend in a day watching new trailers, viral video clips, and shaky cell phone footage of people arguing on live television. This is why every day The Atlantic Wire highlights the videos that truly earn your five minutes (or less) of attention. Bo Obama gets his first taste of life as a White House surrogate, railguns are becoming real at an alarming rate, and Sarah Palin lets HBO know she's watching.

Bo Obama (the president's dog) is the star of a new informational video about how to register for this year's White House Easter Egg Roll. The Egg Roll has caused problems for President Obama in the past, so turning to an adorable Portugese water dog makes sense, especially in an election year. Let Bo take the blame for the wooden eggs and whatever healthy alternative to Peeps the White House eventually ends up serving. He's been with the administration for nearly four years, so you know he's loyal and clearly isn't preoccupied with his own career. Both of these qualities, admittedly, also have something to do with the fact he's a dog. [The White House]

Bruce Springsteen Week continued Wednesday on Late Night with guest John Legend, who performed "Dancing in the Dark" like the greatest airport piano bar player ever to step foot in Hartsfield-Jackson. It was an odd song choice, completely redeemed by his obvious affection for the material. That's what these Late Night tribute weeks come down to: seeing familiar faces take on unfamiliar expressions, which in this case is "I'm playing a Bruce Springsteen song on TV. This is terrific." It should be noted that "Dancing in the Dark" also prompted a curious creative choice from The Boss during the shooting of the song's music video, though his was of a dancing nature. [NBC]

Railguns are deadly and terrifying. But until recently, they've only been deadly and terrifying in theory. That appears close to changing now that the U.S. Navy has successfully tested a prototype of an electromagnetic railgun with a range of 100 miles and the ability to shoot rounds at seven times the speed of sound. The guns are being developed for use on warships, but for now, they're just in an anonymous lab in northern Virginia, breathing fire and breaking the sound barrier with bullets on request. [U.S. Navy Research]

Sarah Palin is pushing back against Game Change (the movie) with an ad by her PAC that notes all the nice things people depicted in the film had to say about her performance as John McCain's running mate in 2008. Really, she's not being unreasonable: HBO's ad spots for the film increasingly resemble those of a disaster movie, one that stars lots of worried people talking quietly on buses and in hotel suites. We read Game Change and don't remember the behind-the-scenes intrigue quite hitting DEFCON level the way it seems to in the film. But...creative license! [SarahPalinAK]