The polling, conducted by Democratic firm Public Policy Polling for progressive group, shows a generic Democratic candidate leading Republican Reps. Ed RoyceEdward (Ed) Randall RoyceHouse lawmakers renew push for war authorization GOP senator: Trump should have invited Dems to state dinner The battlefield of information warfare has been leveled MORE (Calif.), Darrell IssaDarrell Edward IssaCalifornia Republicans seek turnout boost to avert midterm disaster Is Paul Ryan the latest sign of crumbling Republican Party? Lawmakers question FBI director on encryption MORE (Calif.), Scott TiptonScott R. TiptonAmericans want to protect public lands, Congress should listen Two GOP Reps questioned by Israeli police during visit to holy site: report Progressive group targets GOP moderates on immigration MORE (Colo.), John MicaJohn Luigi MicaGOP chairman slams ‘pitiful’ FEMA response in Louisiana 12-term GOP rep gets Dem challenger in Florida Lawmaker gives Metro head 'certificate of appreciation' for firing managers MORE (Fla.), Mario Diaz-BalartMario Rafael Diaz-BalartCuba set to pass power from Castro family Ryan leaves legacy of tax cuts and deficits Relations with Latin America sour under Trump MORE (Fla.), Peter Roskam Peter James RoskamBiz group launches bus tour to promote GOP tax law GOP House super PAC reserves million in fall TV ads GOP authors of tax law double down in campaigns MORE (Ill.), Justin AmashJustin AmashWe need more congressional oversight on matters of war Some doubt McCarthy or Scalise will ever lead House GOP McCarthy faces obstacles in Speaker bid MORE (Mich.), Scott GarrettErnest (Scott) Scott GarrettTrump taps USTR's Gerrish as acting head of Export-Import Bank Frustrated execs clamor for action on bank nominees Manufacturers ramp up pressure on Senate to fill Ex-Im Bank board MORE (N.J.), Rodney FrelinghuysenRodney Procter FrelinghuysenIs Paul Ryan the latest sign of crumbling Republican Party? Loss of Ryan hits hard for House Republicans Sadly, fiscal restraint is no longer a core principle of the GOP MORE (N.J.), Steve StiversSteven (Steve) Ernst StiversRepublicans hold on to Arizona House seat House Republicans prepare to battle for leadership slots Farenthold resigned ahead of ethics ruling against him MORE (Ohio), Jim RenacciJames (Jim) B. RenacciTrump backs Renacci in Ohio Senate race Ohio Democrats launch ad campaign against Renacci on Tax Day The 10 Senate seats most likely to flip in 2018 MORE (Ohio), Joe PittsJoseph (Joe) R. PittsProgress in the fight against human trafficking Pitts op-ed misses mark on Democrat 'betrayals' over ObamaCare Lawmakers considering ObamaCare replacement: learn from 10 anti abortion betrayals MORE (Pa.), Robert HurtRobert HurtDemocrat defeats controversial chair of House Wall Street subpanel Republican groups launch final ad blitz in key House battlegrounds Armed protester stands outside Dem's office for 12 hours MORE (Va.) and Tom Petri (Wisc.), prior to respondents receiving any information about the shutdown.

And six GOP incumbents — Reps. Dave Camp (Mich.), Leonard LanceLeonard LanceImpeaching Rosenstein? Some Republicans are talking about it Some doubt McCarthy or Scalise will ever lead House GOP House Dems add five candidates to ‘Red to Blue’ program MORE (N.J.), Richard HannaRichard HannaRep. Gowdy rips Republican for 'unfortunate' Benghazi remark Republican: Benghazi probe 'designed to go after' Hillary Bipartisan bill would create commission to oversee Iran deal MORE (N.Y.), Michael Turner (Ohio), Rob WittmanRobert (Rob) Joseph WittmanExtending the range of the Air Force with the B-21 Navy chief: On scale of 1 to 10, adequate funding 'scores an 11' Va. lawmakers introduce bill to guarantee back pay for furloughed federal workers MORE (Va.) and Reid RibbleReid James RibbleWith Trump, conservatives hope for ally in 'War on Christmas' GOP rushes to embrace Trump House stays Republican as GOP limits losses MORE (Wisc.) — all take a hit when respondents are told they supported a shutdown, with a generic Democrat either leading or tying each one.

Democrats only need to pick up 17 seats to take back the majority, and previous PPP polling has shown a similar result for the party, prompting speculation that if the 2014 elections were held today, Democrats would take back the House.

And a new CNN-ORC survey released Monday showed a majority of Americans, 54 percent, opposing Republican control of the House.

Still, Democrats aren't yet contesting and don't have contenders in most of those districts. The real concern for Republicans lies in the overall opposition to the shutdown, and the fact that backlash is significant enough that it appears to be hurting even lawmakers considered safe.

But the polling memo itself, written by PPP's Jim Williams, issues a warning even as it strikes an optimistic tone:

"A new round of post-shutdown polling shows that Democrats not only have an opportunity to take back the House of Representatives next year, but that they could win a sizable majority if," Williams writes, "voter anger over the shutdown carries into 2014."

Republicans note that it's still more than a year out from Election Day, and problems with ObamaCare could overshadow the shutdown and minimize any damage the party has suffered thus far.

Sample sizes for PPP's new surveys were between 600-1,000 voters per district, and the surveys were conducted Oct. 15-18.