Donald Trump increases lead in Iowa per Public Policy Poll, 9/18-20, 2015. Trump at 24, up 5 points since August among Republican Primary voters

.
9/22/15, "Trump Continues To Lead in Iowa; Clinton in Good Shape," Public Policy Polling, 9/18-9/20/15 poll

Trump 24

Carson 17
Fiorina 13
Cruz 8
Rubio 8
Bush 6
Huckabee 6
Walker 5
Jindal 4
Paul 4
Kasich 2
Christie 1
Santorum 1

Above data, second page after press release.

"“For all the controversy over the last six weeks Donald Trump’s in a slightly stronger position now than he was after the first debate,” said Dean Debnam, President of Public Policy Polling."...

"Public Policy Polling surveyed 488 usual Republican primary voters and 494 usual Democratic primary voters from September 18th to 20th. The margin of error for both parties is +/-4.4%. 80% of participants responded via the phone, while 20% of respondents who did not have landlines conducted the survey over the internet."

==================

In August 2015 Trump was at 19 in PPP Iowa poll. Poll dates Aug. 7-9, 2015. Released Aug. 10:

Trump 19

Carson 12
Walker 12
Bush 11
Fiorina 10
Cruz 9
Huckabee 6
Rubio 6
Kasich 3
Paul 3
Jindal 2
Santorum 2

"Public Policy Polling surveyed 619 usual Republican primary voters and 567 usual Democratic primary voters from August 7th to 9th. The margin of error for the Republicans is +/-3.9% and forthe Democrats it’s+/-4.1%. 80% of participants responded via the phone, while 20% of respondents who did not have landlines conducted the survey over the internet."

................