BostonGlobe.com Political Headlines - October 22, 2012

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

• Focus on Iran in presidential debate run-up: Both the Obama and Romney campaigns were cautious when discussing a report of possible talks between the US and Iran on nuclear development. Globe correspondent Callum Borchers reports.

• Deficit, green jobs divide an Iowa town: A wind-energy tax credit has proved to be a point of contention between President Obama and Mitt Romney as they compete for the votes of Iowans.  Boston.com politics editor Glen Johnson explains.

• Mass. Senate rivals use similar playbook: Scott Brown and Elizabeth Warren warned voters about the high stakes in their Senate race, as each candidate portrayed the other as a standard-bearer for partisans. Globe Metro reporter Stephanie Ebbert explains.

• Is the foreign policy debate irrelevant?: The foreign policy presidential debate has been fighting for relevance because of the gap between what is asked and what the winning candidate actually faces as president. Globe columnist Juliette Kayyem writes.

• Whose life is it, anyway?: Jim Carberry, whose wife decided to end her life last year near the end of a terminal bout with cancer, argues fervently that this should be a human right. Globe columnist Adrian Walker elaborates.

• Analysts fault Richard Tisei's criticism of John Tierney: Independent observers say the GOP challenger's argument that Rep. Tierney is a do-nothing lawmaker is not a worthwhile measure of his record. Globe Metro reporter Eric Moskowitz outlines.