Sen. Ted CruzTed CruzOvernight Defense: Senators go to White House for North Korea briefing | Admiral takes 'hit' for aircraft carrier mixup | Lawmakers urged to beef up US missile defense Senators get North Korea briefing in unusual WH visit Overnight Tech: FCC chief unveils plan for net neutrality rollback | Tech on Trump's sweeping tax plan | Cruz looks to boost space industry 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.

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 PaulRand PaulDestructive 'fat cat' tax law a complete flop. It's time to repeal it. Trump must take action in Macedonia to fix damage done by Obama and Clinton We can put America first by preventing public health disasters 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 RubioWhat’s with Trump’s spelling mistakes? Boeing must be stopped from doing business with Iran Top Trump officials push border wall as government shutdown looms MORE (R-Fla.) and Rep. Paul RyanPaul RyanOvernight Regulation: Senators call for 'cost-effective' regs | FCC chief unveils plans to roll back net neutrality Overnight Tech: FCC chief unveils plan for net neutrality rollback | Tech on Trump's sweeping tax plan | Cruz looks to boost space industry Not too shabby: Trump tax plan nails corporate rate, errs on income 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 ReidDraft House bill ignites new Yucca Mountain fight Week ahead: House to revive Yucca Mountain fight Warren builds her brand with 2020 down the road 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 McConnellMitch McConnellLawmakers push one-week stopgap funding bill Overnight Finance: Inside Trump's tax plan | White House mulls order pulling out of NAFTA | New fight over Dodd-Frank begins Dem rep: Trump's tax plan as believable as 'magic, unicorns or Batman' MORE (R-Ky.), House Speaker John BoehnerJohn BoehnerLobbyists bounce back under Trump Business groups silent on Trump's Ex-Im nominee Chaffetz won't run for reelection MORE (R-Ohio) and Sen. John McCainJohn McCainTrudeau, Trump speak for second night about US-Canada trade McCain: China has done ‘nothing’ on North Korea Trump administration weighing order to withdraw from NAFTA 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.