In the 2004 contest, Specter narrowly held off Toomey, winning by just over 17,000 votes out of 1.4 million cast. I’ve built a spreadsheet of the county returns that can be viewed here. The map at left gives a visual of each candidate’s regional strengths. Specter counties are in blue; Toomey counties in red. For the most part, the primary results hewed to the conventional wisdom about Pennsylvania politics. Namely, western and central Pennsylvania tend to be more conservative than the southeastern part of the state, centered around Philadelphia. The Philly area is not only the more liberal part of the state but it is also Specter’s base going back to the beginning of his career as Philadelphia District Attorney. The one exception to this pattern is the area to the north of Philly in the Lehigh Valley. This was the area represented by Toomey during his four terms in the House so it’s not surprising that they supported him in his Senate race
More importantly, we need to look at the county by county vote in terms of overall votes. Obviously the electorate is spread out unevenly across the state so the above map only gets us so far in understanding what happened. In my data set I’ve created a variable called “County Share” which calculates the percentage of the overall vote produced by a particular county. This allows us to see the concentration of voters. One thing we find, for example, is that half of Pennsylvania’s primary vote came from just 10 counties, as shown in the map at left. As we see, nine of these are found in the southeastern and south central part of the state. Another way of stating this is that the largest concentration of voters came from Specter’s backyard. This can be further seen when looking at the “Specter Share” or “Toomey Share” variable. Here, I look at how much of each candidate’s vote came from each county. If both candidates were equally strong in each county, we’d see no difference in these numbers. The fact that we see variance confirms the fact that each candidate had different bases of support. Again, for Specter it’s the Philadelphia area that allowed him to squeak by. Montgomery County is a good example. As I wrote during last year’s primary season, Montgomery County is a large suburban county increasingly characterized by voters who are affluent, highly educated, socially liberal, yet fiscally moderate. For the pro-choice Specter, this was the place to run up the score. In 2004, he received 9.2% of his votes in Montgomery, compared to Toomey who received only 6.6% of his votes there. Specter also won significantly more of his votes in neighboring Delaware (7% vs. 5.7%), Bucks (6% vs. 4.9%), and Chester (5.1% vs. 4.2%) Counties as well as the city of Philadelphia (4.1% vs. 2.9%). Thus, without the cushion provided in this part of the state, Specter would not have survived. Also helping him fend off Toomey were endorsements by President Bush and the state’s other senator, the arch-conservative Rick Santorum.
So, going into next year’s contest might Specter simply try and repeat his 2004 performance? While in theory this might be desirable, changes over the past several years make following the old playbook precarious. If we look at more recent elections it becomes apparent that much of Specter’s base of support has been defecting from the Republican fold. It must be noted that Pennsylvania primaries are open only to registered partisans. Thus, Specter cannot rely on independents or Democratic voters to carry him to victory. Only registered Republicans will determine his fate, despite his recent attempts to get state leaders to change the primary rules. If we compare party registration figures for 2004 and 2008 we see problems for Specter. I’ve isolated those counties that provided Specter’s best performance to illustrate this point. As we can see, over the past four years Philadelphia, Montgomery, Delaware, Bucks, and Chester Counties have shed over 124,000 registered Republicans. Democrats, meanwhile, have gained over 220,000 registrants. Whether these Republican losses have become independents or Democrats is irrelevant for the primary. The important fact is that they are now out of that electorate and out of Specter’s reach unless he can get them to re-register, a daunting process in the midst of a campaign.
To get a sense of how these changes in the Philly area have been changing the tenor of the state’s politics, its useful to compare the presidential vote in 2004 and 2008 (numbers are provided in the spreadsheet). As shown in the chart at left, Barack Obama performed significantly better than John Kerry in all five of these key counties. This is especially notable in the suburbs. Thus, whereas Kerry’s statewide victory was about 144,000 votes, Obama took the state by 620,000 votes. When Pennsylvania was called so quickly on election night it was because of the sizable shift to the left taken by this region.
So, as Specter contemplates how to approach his looming primary fight, he’s confronted with the fact that the part of the state that has been his base of support for the past three plus decades is in the process of a steady move to the left. Those voters who, while moderate, were willing to stay registered as Republicans have been fleeing the GOP. A more conservative Republican electorate is clearly much more advantageous to Toomey. What Specter needs to hope for is that Republican voters see the virtue in having him in his current position—namely that of a dealmaker in the Senate. Toomey, while more in line with these voters' ideology, won’t have the institutional sway that Specter does. Is an influential, yet Republican-lite Specter more useful than a more pure, but marginalized Toomey? Specter will also hope that Toomey has lost the connection to the state that he had while representing it in Congress. The years spent running an outfit like the Club for Growth have necessarily removed him from the day to day workings of the state. He may thus be hampered in his attempt to swoop back in and knock off someone who has been courting and serving constituents for years.
Another option for Specter that has been discussed would be to run as an independent. Theoretically, he could decide to do this either before or after the primary. Given how much the landscape could change over the next year, its difficult to speculate on which option, if either, would be more desirable. A big unknown so far is what the Democratic field will look like. If Specter wants advice about how to go about this, though, he doesn’t need to go far--just a few steps across the Senate floor. Just three years ago, one of his colleagues went this route—Joe Lieberman. In many ways the Democratic Party’s version of Arlen Specter, Lieberman was challenged from his flank. Defeated in the Democratic primary by Ned Lamont, Lieberman regrouped and was elected as an independent. Thus, while we don't know how Senator Specter will ultimately play the hand he's been dealt, at this point there seem to be troubling signs ahead.