The New York Times digs a little into Lieberman's campaign contributors and unsurprisingly finds that Republican donors - including recipients of Iraq contracts like Bechtel - are in large part funding his $10 million+ campaign so far:

Anyone looking for evidence of Mr. Lieberman’s bipartisan appeal can find it in his roster of recent contributors, which includes organizations that traditionally give more to Republicans. They include engineering and construction firms, some with contracts in Iraq. Those firms include Bechtel, Fluor International and Siemens, which support Republicans 64 to 70 percent of the time, according to data compiled by PoliticalMoneyLine, which tracks campaign and lobbying activities....

Florida Power and Light, which supports Republicans 84 percent of the time, gave $5,000 to Mr. Lieberman. Areva Cogema, a builder of nuclear power plants that gives 70 percent of its contributions to Republicans, contributed $1,000.

An Ohio law firm that directs 80 percent of its donations to Republicans gave $1,000. SRA International, a technology consultant that favors Republicans 66 percent of the time, gave $1,000. America’s Health Insurance Plans, representing health insurers, gives to Republicans 71 percent of the time and donated $2,000 to Mr. Lieberman.

It's unsurprising tht Joe would have contributors like a Republican, beause he votes like a Republican when it counts. Sean Smith doesn't seem to think this is an issue, though:

“It doesn’t mean much to us,” said Sean Smith, Mr. Lieberman’s campaign manager. “If people give us money because they support us, that’s great. But Joe Lieberman is under no obligation to support them. We’re just trying to keep up with the money machine that Lamont is.”

The "money machine that Lamont is" challenged Sean Smith to a spending cap two months ago, and will end up spending millions of dollars less on this campaign than Lieberman will.