WASHINGTON - As President Bush attempts to revive the controversial immigration reform bill he supports, the latest NBC News/Wall Street Journal poll finds that Republicans are abandoning the president, which has dropped his job-approval rating below 30 percent -- his lowest mark ever in the survey. But he isn’t the only one whose support is on the decline in the poll. Congress’ approval rating has plummeted eight points, bringing it below even Bush’s. And just one in five believe the country is on the right track, which is the lowest number on this question in nearly 15 years. http://www.msnbc.msn.com/id/19209733/ In the Democratic race, Clinton has a 14-point lead (39-25 percent) over Illinois Sen. Barack Obama. They’re followed by former North Carolina Sen. Edwards at 15 percent; no other Democratic presidential candidate registers at more than 4 percent in the poll. In April, Clinton had just a five-point lead (36-31 percent) over Obama, and Edwards was at 20 percent. In the GOP field, former New York City Mayor Rudy Giuliani leads the pack at 29 percent. Fred Thompson comes in second at 20 percent, and former Massachusetts Gov. Mitt Romney and Arizona Sen. John McCain are tied for third at 14 percent each. The top two Democrats, though, seem to have upper hand in potential match-ups against the top two Republicans. According to the poll, Clinton leads Giuliani, 48-43 percent (a reversal since March, when Giuliani led Clinton by five points). And Obama tops Thompson, 50-31 percent.