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Iowa and New Hampshire are apparently feeling the Bern. South Carolina, not so much.

Vermont Senator Bernie Sanders now leads his Democratic rival, former Secretary of State Hillary Clinton, by double digits in Iowa and New Hampshire, the first two states where votes will be cast in 2016 to decide the party's presidential nominee.

Sanders is now ahead of Clinton by a margin of 43 percent to 33 percent in Iowa, a CBS/YouGov poll of 646 likely Democratic caucus-goers found.

In New Hampshire, meanwhile, Sanders is trouncing Clinton by a margin of 52 percent to 30 percent among 548 likely Democratic primary voters surveyed.

The news is much better for Clinton in South Carolina, the third state where votes will be cast. There, Clinton leads Sanders by a margin of 46 percent to 23 percent among the 528 likely Democratic primary voters polled.

Vice President Joe Biden, who has not formally declared himself a candidate, received 22 percent support in South Carolina, 9 percent in New Hampshire, and 10 percent in Iowa.

The poll was conducted Sept. 3-10. The margin of error in Iowa was plus or minus 6.6 percent. In New Hampshire it was plus or minus 7.4 percent, and in South Carolina it was plus or minus 6.8 percent.