According to this image circling the Internet, Clinton is on record this week saying that she is a life long Cubs fan. Yet her previous statements claim she's been a Yankee fan for years.
Did she claim to be fan of both teams?
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We can see from her opponents' view on the issues (obviously painted with a negative slant) that Hillary Clinton has claimed to be a long-time fan of both the Cubs and Yankees.
GOP.com (the website of the Republican Party, Clinton's opponent in the elections) claims that (emphasis mine):
In the early 1990s, Clinton pledged allegiance to the Cubs, claiming she’d been a lifelong fan in an interview with Esquire. But running for the Senate in New York, Clinton claimed she’d “always been a Yankees fan.”
In 2006 Clinton Said The Cubs And Yankees Were Her Favorite Teams “Growing Up And Now In My More Mature Years.”
CLINTON: “Thank you very, very much, Jonathan. I don't have time to rebut everything you've said in your introduction. But I cannot let stand that I have ever, ever been a Mets fan. Have to set the record straight. Cubs and Yankees: Those were my teams, and remain my teams, growing up and now in my more mature years.” (Hillary Clinton, Remarks, Washington, DC, 5/23/06)
While Running For Senate, Clinton Said That “She'd ‘Always Been A Yankees Fan.’”
“Later, Clinton asserted that she'd 'always been a Yankees fan.' Couric correctly challenged her, saying she thought the first lady, a native of Illinois, was a Chicago Cubs fan. 'I am a Cubs fan,' Clinton said. 'But I needed an American League team … so as a young girl, I became very interested and enamored of the Yankees.’”
Clinton has claimed consistently to be a fan of the Yankees since 1999, therefore she is qualified to claim that she has been a Yankees fan for years (although her support before 1999 is doubtful).
She has also consistently claimed that she had always been a Cubs fan while growing up, and that she chose to support the Yankees as well because the Cubs were not winning enough.