Rival Hillary Clinton does not have a New York background

His chief weakness is seen by observers as his low profile compared to that of the first lady. Mrs Clinton's campaign has also been up and running for more than a year.

On the other hand - unlike Mrs Clinton - he is a New Yorker. Mr Lazio played his card immediately, highlighting his New York roots.

In the speech announcing his candidacy, Mr Lazio referred to his Democratic rival as an outsider and a "carpetbagger".

"I know you can tell from my accent that I'm a life-long New Yorker," he said. "You see I don't have to fake it. New York isn't just the place I represent. It's my home."

'Moderate conservative'

Last year, Mr Lazio appeared ready to challenge New York Mayor Rudolph Giuliani, but backed down as Republican Party support solidified behind the mayor, then seen as the strongest candidate to take on Mrs Clinton.

Mr Lazio, who characterises himself as a moderate conservative, was elected in 1992 to represent Long Island, a mostly conservative suburban enclave.

He has amassed $3.5m in campaign funds for his Congressional re-election effort, while Mrs Clinton has amassed $12m for her Senate bid.

Mr Lazio is Italian by descent. He is married to Patricia and has two daughters, Molly and Kelsey.