~EXCERPT~Some of Hillary Clinton's top aides said Wednesday that they will forgo pay for February to help conserve cash. In January, about a dozen of Rudy Giuliani's senior staffers also volunteered to go unpaid for the month as the campaign headed toward critical primaries. And last summer, as John McCain ran low on funds, the senator had to let go dozens of workers and aides. So, how much do campaign staffers make?More than they did four years ago. The campaigns have raised record amounts of money during this election cycle—$583 million in 2007 alone, compared with a total of $880...