As always, Gallup has the answer:
Democratic House Speaker Nancy Pelosi's favorable rating is down seven percentage points since May to 29%, a new low for her since assuming the top congressional post.
Pelosi's ratings were 2-to-1 positive, 44% to 22%, when she first assumed the speakership in January 2007, but they became closely divided by March of that year and remained so in November 2008. Views became more negative than positive for the first time in the first half of 2009, possibly because of Pelosi's public stance against the CIA's use of "enhanced interrogation" of terrorist suspects at Guantanamo Bay prison, and her dispute with the CIA over whether she had been briefed on the matter. Spanning the period these issues were in the news, her favorable rating fell from 42% to 32%. Pelosi's favorable rating recovered slightly in the first half of 2010 to 36%, but it has since tumbled to the new low.
Independents in particular have become more negative about Pelosi, with her favorability dwindling nine points among this group since May, to 21%. Nearly 6 in 10 independents (58%) now view her unfavorably, compared with 86% of Republicans and 22% of Democrats.
With her own members running re-election ads trashing her, those numbers aren't surprising. There is little doubt that she will have a much easier time managing things next January when her decimated caucus looks up from the minority benches.