This certainly isn t who the GOP power-brokers want to see in the top two Donald Trump has boasted that he s  leading every poll and in most cases big.  Not anymore. The latest IBD/TIPP Poll shows him in second place, seven points behind Ben Carson.The nationwide survey found that 24% of Republicans back Carson, compared with 17% who say they support Trump.Marco Rubio came in third with 11% and Carly Fiorina fourth at 9%. Jeb Bush, once considered a prohibitive favorite, ranked fifth with just 8% support, which was a point lower than those who say they are still undecided.The IBD/TIPP Poll has a proven track record for accuracy, based on its performance in the past three presidential elections. In a comparison of the final results of various pollsters for the 2004 and 2008 elections, IBD/TIPP was the most accurate. And the New York Times concluded that IBD/TIPP was the most accurate among 23 polls over the three weeks leading up to the 2012 election.The October poll, conducted from Sept. 26 to Oct. 1, included 377 registered voters who are Republican or registered independents who lean toward the Republican Party, with a margin of error of +/- 5 percentage points.Peak Trump? Other polls show Trump s support slipping in recent weeks. The Real Clear Politics average of six national polls shows him falling from 30.5% in mid-September to 23.3% by the end of the month. That average does not include the IBD/TIPP findings.  Things appear to be catching up with Trump on multiple fronts,  said Raghavan Mayur, president of TechnoMetrica Market Intelligence, which conducts IBD s monthly poll.  In addition to facing increasing attacks from other candidates, Trump s boycott of Fox News may have set him back,  Mayur said, noting that the poll was being conducted during Trump s self-imposed hiatus.When asked on CNBC about his slipping poll numbers, Trump said that  if I fell behind badly, I would certainly get out. Carson s gain comes after his controversial remarks on  Meet the Press  that he couldn t support a Muslim for president. See story here. Rubio s third-place standing shows he has gained considerable ground since the second GOP debate. But Fiorina, who was widely seen as having won that debate, has been unable to capitalize on it with Republicans. Via: IBD 