Dan Nowicki

The Republic | azcentral.com

Former President Bill Clinton, who in 1996 became the only Democrat since President Harry Truman to carry Arizona, will campaign in Phoenix and Tucson Sunday on behalf of his wife, Democratic presidential front-runner Hillary Clinton.

Hillary Clinton, the former secretary of State, is expected at a campaign event on Monday, one day before Arizona's Democratic presidential primary.

Bill Clinton, according to Clinton's campaign, "will make the case for why Hillary Clinton is the best candidate to raise incomes, improve education and break down racial, social and economic barriers for families as president."

No other details about either Clinton visit are available yet.

Hillary Clinton, who won Arizona's 2008 primary during her unsuccessful race against future President Barack Obama, has led in the few Arizona polls that have been publicly released, but is facing an aggressive threat in the state from her rival for the 2016 Democratic nomination, U.S. Sen. Bernie Sanders of Vermont.

Sanders is scheduled to have appeared at four campaign events around Arizona before primary day and is spending heavily on TV ads.

Editorial: Hillary Clinton has the experience to lead