If, as Andy Warhol said, everyone eventually gets their 15 minutes of fame, LuAnn Lavine is getting hers. Or at least five, maybe six minutes. In the week or so since she stood up in a crowd and asked President Obama how he planned to help the housing market, the Geneseo, Ill., real estate agent has been showered with media attention — here she is, asking her question in a clip on “NBC Nightly News,” there she is on CBS’ “Sunday Morning.” Here she is in a Chicago Sun-Times story, there she is on her local news. Most improbably, perhaps, there she is in the lead sentence of influential columnist Maureen Dowd’s Aug. 21 piece in the New York Times, explaining why she sought out President Obama on his recent bus tour through western Illinois.