Sen. Conrad Burn's re-election campaign is shaping up to be a test of whether voters think the GOP is the "party of corruption," as Democrats charge. As Burns seeks his fourth term, Democrats have been loudly broadcasting the incumbent's ties to disgraced former lobbyist Jack Abramoff, who pleaded guilty to corruption charges earlier this year. Burns was a top recipient of campaign contributions from Abramoff and his Indian tribe clients, according to the Center for Responsive Politics, a nonpartisan campaign finance organization. So far, Democratic efforts seem to have paid off. Burns's seat is widely considered one of the most vulnerable–a recent poll by Mason Dixon polling shows his job approval rating at just 38 percent. In 2000, Burns beat his Democratic opponent by just 3 percentage points, even though President Bush carried the state. Burns, however, easily won the Republican primary last week. His Democratic challenger will be Jon Tester, president of the state Senate and an organic farmer.