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THE MATH – Wednesday, March 19 – TURNOUT and Senator Clinton’s Best-Case Scenario for Popular Votes
3:00 p.m. Eastern Time (US)
With the Clinton Campaign making its case for nomination using popular votes, I’ve been wondering about the probabilities of Senator Clinton winning in this area. Almost everyone can agree that her campaign’s probability of at least narrowing the margin in popular votes is high, given the polls for upcoming contests. So let’s take a look.
FIRST, ABOUT PLEDGED DELEGATES
Looking at bell curves for both candidates based on probability densities of strength-of-win, we can determine the probable outcome of the race for pledged delegates. Senator Obama has a 97.1% probability of winning the most pledged delegates, while Senator Clinton has a 2.9% probability of winning the most pledged delegates. These are my own calculations, based on the results of previous contests as reported, and based on polls for upcoming contests.
Why, you may ask, isn’t it a 100% probability by now for Senator Obama to win a majority of pledged delegates? The answer in one word: Arkansas. Senator Clinton was outside her bell curve by a significant enough margin with her 70% win in Arkansas.
TURNOUT BY POPULATION
The average turnout by population for primaries-only so far this year is 13.2%. I don’t use a percentage of registered Democrats to determine turnout because some primary contests are open and some primary contests are closed. The 13.2% figure is a good indicator of the public interest in voting in this year’s Democratic primaries, and it provides a good average or basis to project probable turnout in upcoming contests.
It is more difficult, however, to project a range of probable turnout. This is where we dig out our history books to look at past turnout by population.
The Pennsylvania primary in 1992 is a good place to start. Bill Clinton had about 1,400 pledged delegates at this point in the primary season in 1992, with over 2,100 delegates needed to nominate, before Pennsylvania. Turnout in the Pennsylvania Democratic primary in 1992 was a little over 10% of the state’s population at that time. At this time in 1992, though, Bill Clinton’s lead was more significant, and as such the public interest in voting in the Pennsylvania Democratic primary in 1992 was on the low side.
With the average public interest in voting in Democratic primaries so far this year being 13.2% of the population, and a figure of a little over 10% used as a low-range indicator, we can determine a probable high-range of voter turnout by population at 16%. This would be Senator Clinton’s best-case scenario for voter turnout.
POPULAR VOTE TOTALS SO FAR
Status Quo (includes IA,ME,NV,WA): Barack Obama – 13,644,666 (+740,818) Hillary Clinton – 12,903,848 (Source: Wikipedia 3/17/08 plus states listed above)
Primaries only (Status Quo) (includes WA): Barack Obama – 13,173,496 (+533,947) Hillary Clinton – 12,639,549
With Florida only added (includes IA,ME,NV,WA): Barack Obama – 14,220,880 (+446,046) Hillary Clinton – 13,774,834
With Michigan only added* (includes IA,ME,NV,WA): Barack Obama – 13,644,666 (+412,509) Hillary Clinton – 13,232,157 *Uncommitted – 238,168 (Michigan only, Obama wasn’t on the ballot)
With Florida AND Michigan added* (includes IA,ME,NV,WA): Barack Obama – 14,220,880 (+117,737) Hillary Clinton – 14,103,143 *Uncommitted – 238,168 (Michigan only, Obama wasn’t on the ballot)
POLLS USED FOR PROJECTIONS
Have a look at my previous journal entries for sources. The polls are summarized here: Pennsylvania – Senator Clinton +16.2 Guam – No Poll (Even) Indiana – Senator Obama +15.0 North Carolina – Senator Obama +5.4 West Virginia – Senator Clinton +21.0 Kentucky – No Poll (Even) Oregon – Senator Clinton +8.0 Puerto Rico – No Poll (Even) Montana – Senator Clinton +12.0 South Dakota – No Poll (Even)
PROJECTIONS OF POPULAR VOTES
Pennsylvania has an estimated 2007 population of 12,432,792. The scenarios used below use estimated 2007 population for all the state contests remaining, including Pennsylvania. Notice how Senator Clinton’s gains in net popular vote totals are projected to increase in Pennsylvania, and decrease over the course of the remaining contests, yet still show a net increase over today’s totals.
Pennsylvania only: Turnout 10% - Senator Clinton net +198,718 popular votes Turnout 13.2% - Senator Clinton net +262,374 popular votes Turnout 16% - Senator Clinton net +318,072 popular votes
All remaining contests, including Pennsylvania: Turnout 10% - Senator Clinton net +108,858 Turnout 13.2% - Senator Clinton net +143,729 Turnout 16% - Senator Clinton net +174,241
BEST-CASE SCENARIO FOR PENNSYLVANIA FOR SENATOR CLINTON
A high-end turnout will result in the following popular vote projections after Pennsylvania (adding 318,072 net popular votes for Senator Clinton):
Status Quo (includes IA,ME,NV,WA): Barack Obama wins by 422,746 popular votes
Primaries only (Status Quo) (includes WA): Barack Obama wins by 215,875 popular votes
With Florida only added (includes IA,ME,NV,WA): Barack Obama wins by 127,974 popular votes
With Michigan only added* (includes IA,ME,NV,WA): Barack Obama wins by 94,437 popular votes *Uncommitted – 238,168 (Michigan only, Obama wasn’t on the ballot)
With Florida AND Michigan added* (includes IA,ME,NV,WA): Hillary Clinton wins by 200,335 popular votes *Uncommitted – 238,168 (Michigan only, Obama wasn’t on the ballot)
BEST-CASE SCENARIO FOR REMAINING CONTESTS FOR SENATOR CLINTON
A high-end turnout will result in the following popular vote projections after all remaining contests (adding 174,241 net popular votes for Senator Clinton):
Status Quo (includes IA,ME,NV,WA): Barack Obama wins by 566,577 popular votes
Primaries only (Status Quo) (includes WA): Barack Obama wins by 359,706 popular votes
With Florida only added (includes IA,ME,NV,WA): Barack Obama wins by 271,805 popular votes
With Michigan only added* (includes IA,ME,NV,WA): Barack Obama wins by 238,268 popular votes *Uncommitted – 238,168 (Michigan only, Obama wasn’t on the ballot)
With Florida AND Michigan added* (includes IA,ME,NV,WA): Hillary Clinton wins by 56,504 popular votes *Uncommitted – 238,168 (Michigan only, Obama wasn’t on the ballot)
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Notice that there is only one scenario where Senator Clinton would win the popular vote in a best-case scenario of high voter turnout. That would be to include the January totals for both Florida and Michigan, with zero votes for Senator Obama in Michigan.
Notice also that if a revote is held in these states, Senator Obama might gain those 238,168 “Uncommitted” popular votes back in Michigan, and then Senator Clinton would lose the popular vote in every scenario.
If revotes happen, Senator Clinton’s only chance to win the popular vote would be to have a highly improbable turnout of 30% of the total population.
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