Oregon Rep. David Wu (D) could be vulnerable to a primary challenge if he follows through with his pledge to seek reelection.

The seven-term lawmaker's campaign account is in the red, which may only serve to encourage potential Democrat challengers who will be watching whether donors will continue to support the beleaguered incumbent.

Wu has been under pressure in recent weeks after it emerged that days before the Nov. 2 vote he sent staffers a picture of himself wearing a tiger costume and e-mails written in the voices of his children.

His behavior prompted a half-dozen staffers to quit and for his long-time pollster, Lisa Grove, to tell The Oregonian that she would not work for him again.

Still, Wu recently filed a statement of organization with the Federal Election Commission and he met with activists back in Oregon's 1st district over the weekend before returning to Washington on Monday night. 

"We met with Congressman Wu yesterday, and what we saw is that he is very healthy, very determined and very focused," said Trent Lutz, executive director of the state Democratic Party. "As he puts it, everybody has a chance to kick the tires."
 
Wu was making the rounds as supporters have begun floating the names of several Democrats who could step in for the congressman, including former labor commissioner Brad Avakian, state Sen. Suzanne Bonamic and former state Attorney General candidate Greg Macpherson.

Wu reported $7,500 in his campaign at the start of the year, but he's carrying $60,656 in debt. Democratic strategists note the Wu is strong campaigner, having won by double digits last November despite it being a Republican wave year.

But he could be losing institutional support. Democratic Congressional Campaign Committee head Steve Israel (N.Y.) refused to comment Monday on Wu's future prospects.