So, the time-frame of September 1-15, 2015 has come and gone and there was a BEVY of polls for both parties, both nationally and statewide. There were also some interesting poll results on issues, also worth a look.
Here is a recap. You can find the links to the categories in the OP.
GOP nomination polling:
GOP nomination - national polling:
PPP (D), released 01.09.2015:
Trump +14
Gravis (R), released 02.09.2015:
Trump +15.9
The Economist/YouGov, released 03.09.2015: Trump +25
IPSOS/Reuters (5 day rolling), released 05.09.2015: Trump +18.9
Zogby Analytics, released 06.09.2015: Trump +16 ("Millenials" only)
Emerson College, released 09.09.2015: Trump +14
CNN/ORC, released 10.09.2015: Trump +13
Morning Consult (R), released 10.09.2015: Trump +13
IPSOS/Reuters (5 day rolling), released 11.09.2015: Trump +23
ABC/WAPO, released 13.09.2015: Trump +13
CBS/NYT, released 15.09.2015: Trump +4
IPSOS/Reuters (5 day rolling), released 15.09.2015: Trump +15
That makes for 12 national polls over 15 days, with ony pollster being a repeater (IPSOS/Reuters, 5 day rolling). Noticeably absent from this list of pollsters is Rasmussen Reports, which I thought would put out a national poll before the second debate. You can see the complete numbers at the R-nomination link in the OP, but two factors are very consistent: Trump is always on top and Carson is now firmly in second place. Bush and Cruz tend to be in 3rd place.
Now, some interesting math. If we move the two repeaters (IPSOS/Reuters from 05.09 and 11.09) and only use the latest IPSOS/Reuters numbers, without removing any upper or lower possible outliers, then the average for Trump over 14 days is: Trump +14.3. Remove the lowest and the highest margins (Trump +25, Trump +4), and with those 8 polls, the average is: Trump +14.2. Please notice that those two averages are pretty much identical to each other.
GOP nomination - state polling:
At the link from the OP, you will find polls from Iowa, New Hampshire, Alabama (rare), Florida, Georgia, South Carolina and California (also rare). Lots of internals are also to be found a the link.
DEM nomination polling:
DEM nomination - national polling:
PPP (D), released 01.09.2015: Clinton +35
Gravis (R), released 02.09.2015: Clinton +28.2
The Economist/YouGov, released 03.09.2015: Clinton +19
IPSOS/Reuters (5 day rolling), released 05.09.2015:
Clinton +21.3
Monmouth University, released 08.09.2015:
Clinton +25
Emerson College, , released 09.09.2015: Clinton +27
CNN/ORC, released 10.09.2015:
Clinton +10
Morning Consult (R), released 10.09.2015:
Clinton +24
IPSOS/Reuters (5 day rolling), released 11.09.2015:
Clinton +14
ABC/WAPO, released 13.09.2015:
Clinton +18 (with Biden), Clinton +28 (without Biden)
CBS/NYT, released 15.09.2015:
Clinton +20
IPSOS/Reuters (5 day rolling), released 15.09.2015:
Clinton +19.5
Again, some interesting math. If we move the two repeaters (IPSOS/Reuters from 05.09 and 11.09) and only use the latest IPSOS/Reuters numbers, without removing any upper or lower possibl outliers, then the average for Clinton over 14 days is: Clinton +23.6. Remove the lowest and the highest margins (Clinton +35, Clinton +10), and with those 8 polls, the average is: Clinton +23.8. Please notice that those two averages are very, very close to each other. Welcome to my world of simple polling math. Experience has taught that there are, with large groups of polling, likely one or two outliers and at the end of the day, since they tend to appear on both the high and low end of the spectrum, keeping them in the averages or ditching them really makes no difference, for they tend to cancel each other out.
There are two major constants in the DEM nomination polling as well: Clinton is solidly in 1st place, Sanders is in 2nd place. And when you remove a possible Biden candidacy from the picture, Clinton profits from his absence in polling, he lead over Sanders expands quite demonstrably.
Two differences between the DEM and GOP polling (national):
1.) Clinton's margin average over the Democratic field is 10 points higher than Trump's margin average over the Republican field.
2.) The second place candidate in the GOP field (Carson) is rising fast. The second place candidate in the DEM field (Sanders) remains static.
Let's take a closer look at the 3 IPSOS/Reuters five day rolling polling values:
GOP: Trump +25, +23, 15
DEM: Clinton +21.3, +14, +19.5
The Trump numbers have shrunk, according to IPSOS/Reuters, whereas Clinton's numbers dipped and then rebounded. This can mean one of two things: since rolling polling tends to be a cyclical thing, then the GOP and the DEM values are occuring at different points in a so-called "sinus curve", or Carson really IS picking up steam and this is the first sign that September may end up being known as the month of Carson. Wait and see.
In DEM statewide polling, the same states that were polled for the Republicans were also polled for the Democrats. We see, generally, good movement for Sanders in IA and NH, but Clinton is still firmly ahead in SC and in all the other Southern states polled thus far this month, also in California.
Clinton / Biden / Sanders vs. GOP matchups: National and State polling:
There was a bevy of national polling, and you can see all the results at the corresponding links above, but in a nutshell:
PPP (D), released 03.09.2012: 10 Clinton matchups, she wins 9 of 10, one is a tie. 2 Biden matchups, he wins both. 5 Sanders matchups, he wins 2, loses 3. The margins range (in a two-man race) from Clinton +7 to Carson +6.
SUSA, released 04.09.2015: Trump against 4 DEMS (including, for some strange reason, Al Gore), Trump wins all 4, by between +3 to +5. The SUSA internals indicate Trump getting 25% of the black vote, which is extremely unlikely. I did a posting elsewhere in USMB where I showed that SUSA made this same mistake with Obama vs. Romney in November of 2011, especially in the state of Ohio.
Emerson college, released 09.09.2015: 5 Clinton vs. R matchups, 1 Sanders vs. R matchups. The GOP wins all 7 matchups, with between +2 to +8 (Trump over Sanders)
CNN/ORC, released 10.09.2015: 3 Clinton vs Trump, Bush and Carson matchups. Likewise for Biden against the three. There is one tie (Clinton and Trump, both at 48), Clinton loses the other two. Biden wins 2, loses 1. The margins range from Biden +10 to Carson +5. This is yet another poll where in GE matchups, Carson does better against the Democrats than Trump does.
Morning Consult (R), released 10.09.2015: 5 Clinton vs. GOP matchups, she wins 4 of 5. The exception is Trump +1 over Clinton. Again, Morning Consult is a REPUBLICAN pollster, yet shows better results for Clinton than CNN/ORC. Interesting.
NBC/Telemundo/Marist, released 11.09.2015: 8 matchups total 4 Clinton vs. GOP, 4 Biden vs. the same four GOPers (Bush, Cruz, Trump, Rubio). Both Clinton and Biden handily win all matchups, from +4 to +18. There is also a Latino vote sub-component of the poll, showing Clinton and Biden leading Trump among Latinos by +47 and +51, respectively. That may well be one of the most important data-points of September, 2015.
ABC/WAPO, released 13.09.2015: Clinton vs. Trump, Biden vs. Trump, both measured under the General Population and with RV only. All four matchups go to the Democratics, but it's a statistical tie Clinton (46) / Trump (43) among RV. There are also internals about the Latino vote here worth looking at.
In state matchup polling, there were some very interesting happenings.
First, we got a VERY rare poll from the impenetrably RED state of Utah, showing Trump only 10 points ahead of Clinton. I alread did a write up about this poll here in USMB.
One poll from IA, one from NH and one from Florida. The Florida polling numbers are very bad news for Clinton overall, but also bad news for Bush and Rubio. Take a look at it at the link.
The first 15 days of September were very sparse in terms of state D-vs-R presidential matchups.
ISSUES POLLING:
I was behind the 8-ball in getting all of the issues polling in, but there is an interesting set of results from Gallup about Trump's image, a CNN poll about the Iran Deal and possible government shutdown over Planned Parenthood, Immigration, Birthright citizenship and Abortion. Interesting stuff.
So, that now wraps-up the polling from 01-15 September, 2015.