Democrats trail Republican John McCain, according a Reuters/Zogby poll released on Wednesday.
The poll showed Arizona Sen. McCain, who has clinched the Republican presidential nomination, is benefiting from the lengthy campaign battle between Obama and Clinton, who are now battling to win Pennsylvania on April 22.
McCain leads 46 percent to 40 percent in a hypothetical matchup against Obama in the November presidential election, according to the poll.
That is a sharp turnaround from the Reuters/Zogby poll from last month, which showed in a head-to-head matchup that Obama would beat McCain 47 percent to 40 percent.
Matched up against Clinton, McCain leads 48 percent to 40 percent, narrower than his 50 to 38 percent advantage over her in February.
Among independents, McCain led for the first time in the poll, 46 percent to 36 percent over Obama.
He was behind McCain by 21 percent among white voters.
For the matchup between McCain and his Democratic rivals, 1004 likely voters were surveyed. It has a margin of error of plus or minus 3.2 percentage points.
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