Veteran GOP Rep. Clay Shaw is suddenly trailing by 10 points in his closely-watched reelection campaign against Dem challenger Ron Klein, according to a new poll released today by the Miami Herald. The survey finds Klein ahead of Shaw 49.2%-39.6%, a significantly larger spread than other recent polls have found. The race is attracting national attention as a key harbinger of what's going to happen nationally on election day, according to Amy Walter, who tracks House races for the Cook Political Report. "If he were to lose, it would say everything about the environment and very little about Clay Shaw," Walter tells the Herald, adding that should Shaw fall, it's likely that Dems will pick up other key Florida seats, such as those of former GOP Rep. Mark Foley and Senate candidate Katherine Harris. "What voters are doing now is that they don't see these as individual candidates as much as proxies for the national party."