Obama leads McCain in November match:

WASHINGTON (Reuters) - Democrat Barack Obama has opened an 8-point national lead on Republican John McCain as the U.S. presidential rivals turn their focus to a general election race, according to a Reuters/Zogby poll released on Wednesday.

Obama, who was tied with McCain in a hypothetical head-to-head matchup last month, moved to a 48 percent to 40 percent lead over the Arizona senator in May as he took command of his grueling Democratic presidential duel with rival Hillary Clinton.

The Illinois senator has not yet secured the Democratic presidential nomination to run against McCain in November.

The poll also found Obama expanded his lead over Clinton in the Democratic race to 26 percentage points, doubling his advantage from mid-April as Democrats begin to coalesce around Obama and prepare for the general election battle with McCain.

"Obama has been very resilient, bouncing back from rough periods and doing very well with independent voters," pollster John Zogby said. "The race with McCain is going to be very competitive."

The poll was taken Thursday through Sunday during a period when Obama came under attack from President George W. Bush and McCain for his promise to talk to hostile foreign leaders without preconditions.

Obama's gains followed a month in which he was plagued with a series of campaign controversies and suffered two big losses to Clinton in Pennsylvania and West Virginia.

The poll was conducted after Obama denounced his former pastor, the Rev. Jeremiah Wright, who made a series of public appearances that rekindled a controversy over his inflammatory comments on race and religion.

Obama also survived a furor over his comments about "bitter" small-town residents who cling to guns and religion out of frustration over their economic concerns.

Obama edged closer to clinching the Democratic nomination on Tuesday when he split two nominating contests with Clinton, beating the New York senator in Oregon and losing in Kentucky to gain a majority of pledged delegates won in state-by-state nominating contests.

The results put him within easy range of the 2,026 delegates needed for the nomination. Just three Democratic nominating contests remain before voting concludes on June 3.