BostonGlobe.com Political Headlines - September 14, 2012

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

• Foreign affairs suddenly at issue in presidential race: The unfolding situation in Libya and elsewhere in the region almost ensures foreign affairs will be more than a footnote in the final weeks of the election. Globe politics reporter Matt Viser details. 

• Obama and Romney economic advisers spar on taxes, US aid: Lawrence Summers, the architect of President Obama's stimulus plan, and N. Gregory Mankiw, a key adviser to Mitt Romney, laid out visions on how to repair the economy. Globe business reporter Megan Woolhouse writes.

• Warren ad is first to go on attack in campaign: Warren ad is first to go on attack in campaign: The 30-second ad features the trainer for Lowell boxer Mickey Ward, who accuses Brown of working against the interest of working people. State House bureau chief Frank Phillips and politics reporter Noah Bierman cover.