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Frank's sister, veteran Democratic party leader Ann Lewis, is a senior adviser to the Clinton campaign. He has been a longtime friend of Bill and Hillary Clinton.
When Baldwin endorsed Clinton last summer, she cited her longstanding friendship with the senator as well as a shared commitment to health care reform. In addition, the Wisconsinite described Clinton as "strong and vocal" in her support of ending employment discrimination against gays and lesbians.
Baldwin acknowledged at the time, however, that she and Clinton do not see eye to eye on the issue of same-sex marriage. The New York senator supports domestic partnership initiatives and civil unions, but has opposed moves that allow gay and lesbian couples to wed.
"It's not my position," Baldwin said of Clinton's stance. "I support full marriage equality. We will voice encouragement for (Clinton) to be open to changing her opinion."
Clinton's chief rivals for the Democratic nomination, Illinois Senator Barack Obama and former North Carolina Senator John Edwards, share the front-runners opposition to same-sex marriage.
In contrast, Ohio Congressman Dennis Kucinich, a longtime colleague of Frank and Baldwin in the House who is also seeking the Democratic presidential nod, has been an outspoken backer of marriage equality for many years. Says Kucinich, "This is really a question of whether you really believe in equality. When you understand what real equality is, you understand that people who love each other must have the opportunity to be able to express that in a way that's meaningful."