There is conflicting information indicating whether a primary challenge to Arlen Specter is viable in Pennsylvania. Here are the pros and cons:
Pro
Back in December, a Daily Kos / Research 2000 poll of Pennsylvania found Arlen Specter getting crushed among self-identified Democrats. Chris Matthews led Specter 76%-16%, Patrick Murphy led Specter 61%-18%, and Allyson Schwartz led 60%-18%. While none of those Democrats appear likely to run, that is still an eye-opening deficit for Specter against pretty much any Democrat. Keep in mind that Pennsylvania's partisan registration and closed primary system means that only registered Democrats can vote in a primary election.
Arlen Specter is also going to have to give back a lot of money. He has raised hundreds of thousands directly from Republican members of the Senate, who will likely ask for their money back now that he has flipped.
Perhaps most importantly, the primary would take place in the Spring of 2010, right toward the end of the main legislative sessions. If, as in 2009, Arlen Specter casts the majority of his early 2010 votes against President Obama's legislation, he will look very bad on the campaign trail.
Con
March polling from Quinnipiac shows that Specter has very high approval ratings among self-identified Democrats in Pennsylvania: 71%-16%.
It is likely that Specter's support for the stimulus package, which was highly publicized, along with his highly publicized switch to the Democratic Party, both has and will continue to boost his image among Pennsylvania Democrats. By contrast, Specter's opposition to important Democratic legislation, such as the budget, health care reform, and the Employee Free Choice Act, have not been highly publicized. Specter's current media image is probably that of a very pro-Obama Democrat right now, which would make him popular among Democrats.
Further, Specter has lined up promises of financial and campaign appearance support in the event of a hotly contested primary from President Obama, Vice-President Biden, Governor Ed Rendell, Senate Majority Leader Harry Reid, and probably Pennsylvania Senator Bob Casey. He will have an all-star lineup of support surpassing even that enjoyed by Joe Lieberman in 2006.
Overall: Wait until mid-June
It is difficult to draw any conclusions without direct primary polling. Further, polling produced in the next week or two would be heavily skewed in favor of Specter, given the short-term euphoria that always follows events such as these. We will have to wait at least another month or two before relevant data can be collected.
If, two months from now, polls show Specter ahead by lopsided, 20%+ margins against Representative Joe Sestak, then we will probably know very quickly that a campaign isn't viable. However, Specter will also be the subject of intense media scrutiny going forward, and every time he opposes the Obama administration will be heavily publicized. This could mean a quick erosion of his numbers of the next couple of months.
So, it is best to wait and see where the situation stands in June. Specter will have a honeymoon with Democrats over the next two or three weeks, but if he keeps opposing most of President Obama's agenda, he should expect a wave of media coverage that will anger many Pennsylvania Democrats, and make a primary challenge against him quickly viable. As such, it is important that Representative Joe Sestak publicly stay open to a possible run for at least another two months.
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