But there had been speculation that Barber would not seek reelection this fall, his aim being to essentially to be a caretaker of the congressional seat through the end of the year to help see some of Giffords' legislative work through.
And a number of other Democrats have already been raising money and campaigning with an eye to the November race for a newly drawn version of the Tucson area district. However, neither Barber nor his campaign had never confirmed that was his intent, or said exactly what his plans are.
Barber said on Monday he's enjoyed the reception he's received on the special election campaign stump, and that his health is not an issue, but that he wanted to make sure his family was on board before announcing his decision.
"It's taken me obviously almost five weeks to come to this decision, and I wish I could have come to it sooner," said Barber. "I've never been a politician; I had to find out what worked for me and my family."
Barber said he spoken to two three of the Democrats who have already said they were running for the seat he will be vying for this fall, and a fourth who is considering it.
"I didn't ask anyone to drop out," he said. "Each one of them will obviously make their own decision."