Mitt Romney's selection of Paul Ryan as his running mate was a big hit with many GOP activists, but it isn't playing that well yet with the public at large. The Wisconsin congressman was seen as a "fair" or "poor" choice by 42 percent of Americans surveyed in a USA Today/Gallup poll, while 39 percent thought he was an "excellent" or "pretty good" vice presidential choice. That's the lowest favorability of any running mate since Dan Quayle in 1988. But the low rating is likely in large part because many Americans are not very familiar with Ryan, which will change. A Washington Post/ABC News poll found that favorable impressions of Ryan increased 15 percentage points after Romney's announcement Saturday.