specterWith U.S. Sen. Arlen Specter’s defection from the Republican Party on Tuesday rocking Capitol Hill, the big question is: Will the Pennsylvania lawmaker’s big splash turn a sizable Democratic majority into a 60-vote filibuster-proof majority?

New Mexico’s senior senator, Jeff Bingaman, while steering clear of partisan rhetoric, expressed hope Tuesday that Specter’s decision to join the Democratic caucus would translate into an easier time for President Obama’s agenda in the U.S. Senate.

“Sen. Specter has already supported many pieces of President Obama’s agenda this year, but I hope his decision to switch parties means we’ll get the support we need to enact even more of this administration’s initiatives,” Bingaman said in a statement.

When pressed if Specter’s defection might mean big changes on policy questions involving energy, the environment, border security and immigration reform, a Bingaman spokesman later said: “Sen. Specter has said he’s going to continue to be an independent voice, and to my knowledge he’s not laying out his specific positions at this point.”

Bingaman did point out that he and Specter had worked on climate change legislation together.

Michael Rocca, a professor of political science at the University of New Mexico, said the firestorm over Specter’s party switch may end up being more flash than substance.

“I think the switch of any senior partisan … can send shockwaves through D.C.,” Rocca said. “I think the Democrats scored some PR points with this one.”

But, Rocca added: “I don’t think it will make that big of a deal.”

That’s because Specter has been aligned with Democrats on a number of hot-button issues, like global climate change and a women’s right to choose. That has put him out of step with conservative Republicans in Pennsylvania, who were rallying behind a bid by former U.S. Rep. Pat Toomey to unseat the moderate incumbent in the GOP primary. Despite Specter’s support by many Democrats in Pennsylvania, Rocca said it’s unlikely the lawmaker will suddenly become more liberal as a Democrat. “He’s a maverick and he’ll continue to be one.”

Specter himself said as much Tuesday in a statement sure to unsettle Democratic Party loyalists who might be dreaming of a super-Democratic majority.

“My change in party affiliation does not mean that I will be a party-line voter any more for the Democrats that I have been for the Republicans,” the Pennsylvania senator said in a statement.

Specter contrasted his political defection with that of former U.S. Sen. Jim Jeffords of Vermont, whose defection from the GOP in 2001 shifted control of the chamber to the Democrats until Republicans recaptured the majority after the 2002 elections.

“Unlike Senator Jeffords’ switch which changed party control, I will not be an automatic 60th vote for cloture. For example, my position on Employees Free Choice (Card Check) will not change.”

Specter continues to oppose the Employees Free Choice Act, which is organized labor’s top priority and would make it much easier for workers to organize and gain first-time contracts with their employers.

And once the recount drama in Minnesota between Republican Norm Coleman and Democrat Al Franken is finally settled — Franken is expected to be seated once Coleman’s remaining legal appeals are exhausted — Senate Democrats would have the 60 votes needed to invoke the cloture rule, blocking fillibuster attempts by Republicans.

“It’s very important to have a two-party system, a moderate wing of the two-party system,” Specter said during a news conference on Tuesday. “When you take a look at the Pennsylvania Republican electorate, several hundred thousand Republicans shifted last year. We do not have a dominant voice there. We find — I think regrettably — that the extremes of both parties are taking over.”