PETERSBURG, Va. (McClatchy Newspapers) -- The Democrats' decade-long push into Virginia - a national bragging point that they were moving into the once-solid Republican South -- may be coming to an end.

Polls suggest that the Republicans could win the governor's office on Nov. 3 for the first time in more than a decade. One of only two statewide races this year - the other is the governor's race in New Jersey -- the Virginia contest is being watched as a referendum not only on the Democrats' appeal in the region, but also on the party's agenda next door in Washington .
President Barack Obama will campaign in the state on Tuesday to help boost fellow Democrat Creigh Deeds, a state senator from rural western Virginia. In a troubling sign for the Democrats, however, White House aides speaking on background already have started taking shots at Deeds as a poor candidate, lest pundits blame Obama for his defeat.
Whether Virginia's and New Jersey's gubernatorial elections are the first signs of ratification of the previous year's presidential election or early warnings of a popular backlash is a perennial question.
Virginia has a 30-year tradition of voting in governor's races against the party that holds the White House, so a turn this time against the Democrats might be discounted as routine.
The Old Dominion, however, also has emerged in recent years as a national bellwether, and if Deeds loses, that could signal problems for the Democrats nationally in next year's mid-term congressional elections. Obama won the state in 2008 with 52.6 percent of the popular vote, the closest state to his national average of 52.9 percent.
“Virginia is the new Peoria,” said University of Virginia political scientist Larry Sabato, referring to the Illinois city once used as a sociological test lab because it so closely reflected the average American community.
Virginia's also become the frontline for the Democrats' hopes to establish a beachhead in the South -- first in Virginia, then North Carolina, and perhaps even into Georgia.
They won back a U.S. Senate seat in 2006 with former Navy Secretary Jim Webb , then took the other seat from the Republicans in 2008 with Warner. It marked the first time since 1970 that Virginia had sent two Democrats to the Senate . Capping it all, Obama won the state in 2008, the first time a Democrat had won there since Lyndon B. Johnson's coast-to-coast landslide in 1964.
“It was an enormous breakthrough,” Sabato said. “If they lose it so quickly after the Obama victory, people will naturally ask if 2008 was an aberration.” Leading the Republican charge is former state Attorney General Bob McDonnell.