BostonGlobe.com Political Headlines - May 15, 2012

Here are the top POLITICAL headlines from BostonGlobe.com today:    

President Obama strikes at Mitt Romney on jobs: Political reporter Tracy Jan writes about the Obama campaign unveiling its first ad attacking Romney's business record, in an attempt to turn the former Bain Capital chief executive's credentials into a liability.       Barney Frank reflects on the monumental change he's seen: Columnist Joanna Weiss writes about Barney Frank's public career that will end a few months after President Obama endorsed gay marriage. Elizabeth Warren's Democratic allies call on Scott Brown to release fundraising ties to JP Morgan Chase: Members of the Massachusetts Democratic Party called on US Senator Scott Brown to disclose any fund-raising ties he may have to the bank after a Globe analysis found he received more itemized donations from New York City than from any other city in America. Political reporters Michael Levenson and Noah Bierman report.