President Obama e-mailed more than 100,000 supporters of the Democratic National Committee and Obama's own Organizing for America in Connecticut to show his support for Sen. Chris Dodd (D-Conn.) -- a potentially vulnerable incumbent in 2010.

In the message, Obama thanked Dodd for his "extraordinary efforts" on the credit card reform bill the president signed this afternoon at the White House.

"But today -- thanks to the extraordinary efforts by your senator, Chris Dodd -- I signed a bill that restores a sense of fairness and transparency to the credit card insutry," Obama writes in the e-mail. "As Chairman of the Senate Banking Committee, Senator Dodd was the driving force behind this bill."

Obama then asks supporters to send Dodd a thank you note for his "exceptional service," including their name, e-mail address, home address and phone number.

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