UPDATE: USA Today has more:
Ariel Edwards-Levy: "Americans' initial reaction to Paul Ryan is decidedly lukewarm, with more rating his selection for vice president as negative than positive, according to a USA Today/Gallup poll taken after the announcement.
Ryan's ratings were less positive than those for any other vice presidential pick polled on by Gallup since 2000, including Sarah Palin, Joe Biden and Dick Cheney. The only other recent vice presidential selection to gain net negative ratings was Dan Quayle, in 1988.
In a nationwide survey taken Sunday, 39% of registered voters call Republican contender Mitt Romney's selection of Ryan "excellent" or "pretty good" while 45% rate it as "only fair" or "poor." Sixteen percent have no opinion.
That's the most tepid reception for a running mate since 1988, when then-vice president George H.W. Bush picked Quayle, an Indiana senator who immediately ran into questions about his draft history during the Vietnam War and whether he was prepared for the presidency.