It's tough to raise money for an upstart congressional campaign and particularly tough to do so in a down economy, say some of the nine challengers in Maryland's 2nd District race. Their campaign finance reports bear that out: Of the nine, only two reported any income with the Federal Election Commission as of June 30, the most recent filing deadline. "There's the economic situation now, and people with less disposable income, and expenses they're facing," said Robert Imhoff, who volunteers on Democratic challenger Raymond Atkins' campaign. While the challengers may be struggling, it's a different story for incumbent Rep. C.A....