Sen. Ted CruzRafael (Ted) Edward Cruz32 male senators back Senate women's calls to change harassment rules Senate confirms Trump’s pick to lead NASA DOJ denies reports judicial nominee once called illegal immigrants 'maggots' MORE (R-Texas) now leads the Republican presidential primary field, surging in a poll taken shortly after his 21-hour speech given to protest ObamaCare.

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According to the survey, conducted by Democratic-leaning firm Public Policy Polling, Cruz takes 20 percent support among Republican primary voters to former front-runner Sen. Rand PaulRandal (Rand) Howard PaulHeitkamp becomes first Dem to back Pompeo for secretary of State Senate committee sets Monday vote even as Pompeo appears to lack support Trump checkmates Democrats in sending Pompeo to North Korea MORE's (R-Ky.) 17 percent.

New Jersey Gov. Chris Christie (R) takes 14 percent support, while former Florida Gov. Jeb Bush (R) gets 11 percent support. Sen. Marco RubioMarco Antonio RubioSenate confirms Trump’s pick to lead NASA The Hill's 12:30 Report Steps Congress can take to defend America against foreign influence operations MORE (R-Fla.) and Rep. Paul RyanPaul Davis RyanFreedomWorks backs Jim Jordan for House Speaker House, Senate GOP compete for cash Some doubt McCarthy or Scalise will ever lead House GOP MORE (R-Wis.) both take 10 percent, and the rest of the field gets single-digit support.

It's a surge of 9 percentage points for Cruz since the last PPP survey of the GOP presidential field, conducted in July.

The survey was conducted Sept. 25-26, shortly after Cruz finished a nearly daylong speech on the Senate floor to protest Senate Majority Leader Harry ReidHarry Mason ReidDems walk tightrope on Pompeo nomination The Memo: Teens rankle the right with gun activism Dems to party: Go on offense with Trump’s alleged affairs MORE's (D-Nev.) plans to reinstate funding for ObamaCare to a House-passed bill that eliminated it.

The speech was not technically a filibuster, as it wasn't able to prevent the Senate from moving forward on the bill.

Many of Cruz's Republican colleagues criticized the move, and Reid called it "a big waste of time." But the survey indicates it drew a favorable response from Republicans nationwide.

In particular, "very conservative" primary voters favor Cruz, with more than a third breaking for him — twice as much as Paul's share of that vote. And very conservative voters make up the largest part of the GOP primary electorate, at 39 percent.

And Cruz is now seen as more credible than any other Republican leader tested. They see him as more trustworthy than Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnell32 male senators back Senate women's calls to change harassment rules Duckworth brings her baby to Senate vote, drawing a crowd FreedomWorks backs Jim Jordan for House Speaker MORE (R-Ky.), House Speaker John BoehnerJohn Andrew BoehnerSome doubt McCarthy or Scalise will ever lead House GOP Lobbying World McCarthy courts conservatives in Speaker's bid MORE (R-Ohio) and Sen. John McCainJohn Sidney McCainHeitkamp becomes first Dem to back Pompeo for secretary of State Senate committee sets Monday vote even as Pompeo appears to lack support Trump checkmates Democrats in sending Pompeo to North Korea MORE (R-Ariz.).

The survey was conducted among 743 GOP primary voters and has a margin of error of plus or minus 3.6 percentage points.