It seems like a nice gesture – an e-mail message from a loving wife, urging thousands of people to join her in wishing her husband a happy 49th birthday by signing an electronic birthday card. But in Washington, D.C., nothing is that simple. The wife, in this case, is First lLdy Michelle Obama, and the message is being sent by the Democratic Party to people on its list nationwide. And underlying the birthday wishes, the message is political: The electronic card to Barack Obama also is a Democratic Party fundraiser.“Every year, our family tries to come up with a fun...