Bill Clinton will be back on the campaign trail on behalf of President Barack Obama.

Obama's campaign says the former president will hold an event in New Hampshire on Wednesday, the day of the first presidential debate. A debate being held in Denver.

Obama and Republican Mitt Romney debate two more times in October.

In 1992, Clinton became the first Democrat to carry New Hampshire in the general election since 1964.

Clinton has become a key surrogate for Obama, particularly on the economy. He delivered a well-regarded speech at the Democratic Party's convention earlier this month, then made a two-day campaign swing for the president in Florida.

The former president is expected to hold more events for Obama in the campaign's closing weeks.