(CNN) - The Democratic Party's top donors will be urged Tuesday to open up their wallets for Martha Coakley as party leaders scramble to provide her with the financial resources needed to try and win the late Sen. Edward Kennedy's seat, a Democratic Party source tells CNN.
Up to 500 donors are expected to participate in the afternoon conference phone call that will be led by Democratic National Committee Chairman Tim Kaine. Kaine "will make the pitch to the donors and the case against [Republican opponent Scott] Brown," said the source, who spoke on the condition of anonymity. Coakley is also expected to appear on the call where "she will highlight the importance of the race and her own credentials."
The goal is to raise "in the significant six-figure range in the next 48 hours," the source added. Separately, the DNC is expected to inject $500,000 into the race, the source noted.
A DNC spokeswoman would not confirm the call.
Coakley will be in Washington Tuesday to attend a fundraiser with members of the Massachusetts congressional delegation. And the Democratic Senatorial Campaign Committee sent an email Tuesday signed by Sen. John Kerry, D-Massachusetts, asking for donations.
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Brown's campaign said it was able to raise $1.3 million in an Internet fundraising campaign on Monday.
The special election to fill the seat will be held Jan. 19.