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Gallup: No immediate bounce for Romney after Ryan VP pick

Republican presidential candidate and former Massachusetts Governor Mitt Romney (L) and his running mate Rep. Paul Ryan (R-WI) talk on their campaign bus before attending a campaign rally at the Waukesha County Expo Center on August 12, 2012 in Waukesha, Wisconsin. Justin Sullivan

(CBS News) Despite conservative enthusiasm surrounding the announcement that Paul Ryan has been tapped as Mitt Romney's presidential running mate, a new Gallup tracking poll shows that the presumptive GOP nominee has not benefited from any material bounce in its poll since the pick was made public.

According to the survey, 47 percent of registered voters surveyed in the four day period following Romney's announcement said they supported Romney, while 45 percent said they would vote for President Obama. In the four days prior to the announcment, 46 percent backed Romney and 45 percent backed Mr. Obama.

Gallup suggests that Romney may get a delayed bounce, as his polling numbers were slightly better in the second half of the four-day period, but an August 13 Gallup poll reinforces the idea that Ryan's pick got a tepid response from the American people.

According to that poll, 39 percent of Americans said they thought Ryan was either "excellent" or "pretty good" as a VP choice, while 42 percent called the choice "only fair" or "poor." Nineteen percent expressed no opinion.

By contrast, 46 percent of voters called Sarah Palin an "excellent" or "pretty good" choice in 2008, and 46 percent said the same of Biden. Compared to recent vice presidential candidates, only Dan Quayle has scored higher than Ryan among those who believed him to be an "only fair" or "poor" VP pick.