The Boston Globe

US Sen. Olympia Snowe won’t seek re-election

The three-term Republican senator from Maine said in a statement that she was frustrated by ‘‘an atmosphere of polarization and my-way-or-the-highway ideologies.’’

DA to probe Beverly officer’s ties to gunman’s wife

Investigators are exploring the relationship between the Beverly police officer and the Hamilton police sergeant’s wife, who had known each other for a number of years.

Dow closes above 13,000 for first time since 2008

The Dow Jones industrial average has closed above 13,000 for the first time since May 2008, four months before the financial crisis.

Prosecutor: Ohio school shooter chose random victims

The teen accused of killing three students chose them randomly, a prosecutor said today as the young man appeared in juvenile court.

Martha Coakley picks N.J. lieutenant colonel for casino board

Gayle Cameron oversaw numerous police investigations involving Atlantic City casinos.

Arizona, Michigan primaries

Romney accuses Santorum of trying to ‘kidnap’ primary

As voters headed to the polls in Michigan today, Mitt Romney acknowledged missteps in his campaign while also accusing Rick Santorum of trying to “kidnap our primary process” by issuing automated phone calls to Democrats.

Scott Olson/Getty Images

Rick Santorum greeted diners at a restaurant in Grandville, Mich. Recent polls in the state have shown Santorum and Mitt Romney in a close race.

Justin Sullivan/Getty Images)

Mitt Romney greeted a group of children during a visit to his Michigan campaign headquarters in Livonia, Mich.

Justin Sullivan/Getty Images

Romney is hoping to prevent a defeat in his native state that could rattle his campaign and probably draw the race out for months.

Getty Images

A Ron Paul supporter watched the motorcade for Rick Santorum drive away following a campaign stop at a Grandville, Mich., restaurant.

Volunteer Vicki Groff set up a sign outside a school in Phoenix, Arizona today.

Joshua Lott/REUTERS

Volunteer Vicki Groff set up a sign outside a school in Phoenix, Ariz., today.

Joe Raedle/Getty Images

A voter in Royal Oak, Mich., filled out her primary ballot.

Joe Raedle/Getty Images

John Vandermark wore a sticker declaring " I Voted" in Royal Oak, Mich.

Arizona, Michigan voters go to the polls

Mitt Romney and Rick Santorum waited for results tonight that could re-establish Romney as the clear frontrunner or reinforce Santorum’s claim on the party’s conservative base.

BOSTON CAPITAL

Mitt Romney’s bulldog on tax loopholes

As the governor of Mass., Mitt Romney let Alan LeBovidge, then head of the Department of Revenue, identify a list of corporate tax loopholes to eliminate, raising millions in the process.

Globe Insiders

Globe Insider Event | March 5, 5:30 p.m.

‘The Real Romney’

Globe editorial page editor Peter S. Canellos moderates a discussion with Globe writers Scott Helman, Scot Lehigh, and Frank Phillips on the Republican presidential candidate.