Former president Bill Clinton will campaign for US Senate candidate Edward J. Markey in Worcester on Saturday, the latest big-name Democrat to hit the trail in the closely fought Massachusetts Senate race.

Clinton’s visit was confirmed today by two Democratic officials with direct knowledge of the rally. The officials said the location has not yet been decided. The former president will try to boost Markey less than a week after President Obama rallied thousands of Markey supporters at the Reggie Lewis track in Roxbury today.

Michelle Obama has also flown into Boston to raise money for Markey, and Vice President Biden held a fund-raiser for Markey in Washington on Tuesday night.

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Two recent polls show the long-time congressman holding a 7 percentage point lead over Republican businessman Gabriel E. Gomez, although one of those polls indicated that Gomez has cut substantially into Markey’s lead in recent weeks.

The special election to replace John F. Kerry is June 25.