Pennsylvania Democrat Joe Torsella, a candidate for the Senate seat of Republican incumbent Arlen Specter, raised nearly $600,000 in the final six weeks of this year’s first quarter, his campaign said Tuesday.

Torsella, a former Philadelphia deputy mayor who also headed the city’s National Constitution Center, began fundraising in mid-February and has $584,000 cash-on-hand.

Torsella’s first-quarter receipts came almost exclusively from individual donors, according to report summary pages his campaign provided to CQ Politics. And nearly all of the money he raised from individuals was itemized, meaning that the funds came from contributors who gave at least $200.