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NBC/WSJ poll: Voters split on Ryan

According to the new NBC News/Wall Street Journal poll, 22 percent of registered voters say Mitt Romney's selection of Paul Ryan to be his running mate makes them more likely to vote for the presumptive Republican presidential nominee.

That's compared with 23 percent who say the Ryan pick makes them less likely to vote for Romney, and 54 percent who say the new running mate doesn’t affect their vote either way.

These numbers suggest the Ryan pick has had less of an impact on voters than previous running mates have had.

In 2008, 24 percent in the NBC/WSJ poll said Joe Biden made them more likely to vote for Barack Obama, versus 16 percent who said he made them less likely to vote for the Democratic ticket.

The margins for Sarah Palin in 2008 (34 percent more likely vs. 25 percent less likely), John Edwards in 2004 (28 percent vs. 7 percent), and Joe Lieberman in 2000 (20 percent vs. 7 percent) were also bigger than Ryan's.

The closest Ryan’s margin comes to is Dick Cheney’s in 2000 (16 percent more likely vs. 14 percent less likely).

In the poll’s feeling thermometer, moreover, Ryan’s favorable/unfavorable score stands at 33 percent/32 percent.

Democratic pollster Peter D. Hart, who co-conducted this survey with GOP pollster Bill McInturff, attributes Ryan’s mixed numbers to today’s increasingly partisan divide, with Republicans backing him, Democrats opposing him and independents fairly divided.

The full NBC/WSJ poll -- which was conducted Aug. 16-20 of 1,000 registered voters (300 reached by cell phone) -- will be released at 6:30 pm ET.