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“His largest gains were the unaffiliated voters,” said Gregory A. Smith, a Pew research fellow. “Sixty-seven percent of these people voted for Kerry in 2004; 75 percent voted for Senator Obama.”

Eight out 10 Jews (about 78 percent) also supported Mr. Obama, according to Pew. Similar numbers supported former Vice President Al Gore, a Democrat, in 2000 (79 percent) and Mr. Kerry in 2004 (74 percent).

Among Protestants overall, 45 percent supported Mr. Obama, up from the 40 percent who voted for Mr. Kerry. Among white Protestants only, the gain was much smaller. Thirty-four percent of this group voted for Mr. Obama compared with 32 percent who voted for Mr. Kerry.

Among evangelical Christians, 26 percent voted for Mr. Obama compared with 21 percent who voted for Mr. Kerry.