I posted this the last time some crazy implied that Huntsman could win. It seems it has been forgotten.
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Barack Obama, getting pretty much every Dem vote he ever had a chance at in 2008, got about 30% of the eligible voting populace. McCain got about 26%. About 1% voted for someone else. 43% didn't vote at all.
In 2004, it was only slightly different. Bush got about 28.7% of those eligible to vote. Kerry got 27.4%.
So the difference between a "close GOP win" and a "historic Democratic landslide" was that a 1.3% share switched sides (turnout rate was pretty similar).
2000 -- Gore got 24.8%. Bush got 24.6%.
1996 was even worse. One might call this the absolute baseline for the two parties. Clinton got 23.9%. Dole got 19.9%. Perot got 4.1%
1992 -- Clinton 23.3%. Bush 20.6%. Perot 10.4%. Quelle interessante that the biggest difference between the turnout in 1992 and 1996 was the decreased support for Perot. Safe to say that only the partisans voted in '96.
So let's call the Dem baseline 23% and the GOP baseline 20% of the total eligible populace. Almost no matter what, each party is going to get that amount to show up and vote. Dems have a slightly higher registration rate than GOP, so I think this is reasonable.
That leaves 57% of the population that is open to persuasion. Oh but wait, since 1992 between 49-57% of the population has even voted! And we've already accounted for 43% above! So in the highest turnout election we've had since 1968, only about 14% of the voters would have been truly outside the two parties' bases.
The reality is most of those "independents" are really "disinterested" and are unlikely to vote. So, unless there's a candidate that can bring an atypical amount of non-voters out of the woodwork, the two parties' bases are going to constitute at least 75% of the voters in the election, and up to 88%, based on turnout rates since 1992.
It appears also that with Bush, the GOP had more support among those "independents", or else they wouldn't have been able to win in 2000 or 2004. Perhaps the folksiness of Bush going against the stodgy liberals Gore and Kerry made the difference.
I guess it's somewhat encouraging that the last two elections have seen that rate of independent voters rise. But will it stay that way in 2012? I don't think we'll see 57% turnout.
By the way, this information should blow out of the water the myth that depressed turnout favors the GOP. Depressed Democrat turnout favors the GOP, of course, but they need to win the middle to win.
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Huntsman cannot win without strong support in his party, which he does not have. Almost no candidate can. 75-88% of the voters in the election are going to be party devotees.
The article linked in the original post is FOS.