So, did the “Obama Girl” actually vote for Barack Obama on Tuesday? Actually, no. Last summer, the amateur music video “I Got a Crush on Obama” was a Web hit, splashing a seductive performance by a 26-year-old model named Amber Lee Ettinger across millions of screens and prompting deep thoughts about candidates and sex appeal, the YouTube generation of voters, viral marketing and so forth. On Tuesday night, City Room ran into Ms. Ettinger at an election-watching party in Greenwich Village and asked how things went at the polls. “I didn’t get a chance to vote today because I’m not...