(CNN) - One of President Barack Obama's top campaign officials took a not-so-veiled jab at Mitt Romney Monday, tweeting a photo of the president riding in the presidential limousine with his Portuguese Water Dog Bo.
"How loving owners transport their dogs," Axelrod wrote, taking an apparent stab at Mitt Romney, whose own experience transporting pets has become fodder for rival candidates and newspaper columnists.
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Newt Gingrich first introduced the tale of Romney's dog Seamus into the 2012 contest earlier this month when his campaign released a web video featuring Romney awkwardly explaining how his family's Irish Setter ended up in a kennel on the top of a moving car.
The incident took place in the 1980s on a road trip to Canada. As Romney explained in the Fox News clip featured by the Gingrich campaign, "he climbed up there regularly, enjoyed himself. He was in a kennel at home a great deal of time as well. We loved the dog. It was where he was comfortable and we had five kids inside the car and my guess is he liked it a lot better in his kennel than he would have liked it inside."