The sudden opening reflects a growing sense that the potential for big Republican gains has begun to ebb and that Democrats have a real chance of hanging on to their majority.
“Eight months ago, I thought that Republicans had a 60 to 65 percent chance of taking the majority. Now, it’s a 50-50 proposition as to whether Republicans can take the majority,” said Jennifer Duffy, a longtime expert on Senate races who works for the independent Cook Political Report.
Stuart Rothenberg, editor of the Rothenberg Political Report, said he places his “pinkie on the scale” now for Democrats retaining the majority, but added that his calculation hinges on economic improvements, particularly as reflected in the monthly unemployment numbers. “A few more months of less than 200,000 new jobs, and I take my pinkie off that scale,” Rothenberg said.
If Mourdock — a longtime politician twice elected to statewide office — can unify Republicans, he should be a favorite in GOP-leaning Indiana. But if his candidacy gets swept up in the fervor of the tea party movement, as some 2010 Republican nominees did, then Indiana could turn into a headache for national Republicans who would prefer not to expend resources to defend that seat.
“Lugar’s loss in Indiana put the seat in play, but only marginally improved Democrats’ chances of picking it up,” Duffy said.
But it was not supposed to come down to this: Republicans gained six Democratic seats in the 2010 midterm elections and, early on, 2012 looked to be even easier, with 23 Democrats up for reelection, compared with 10 Republicans. The Democratic president was deeply unpopular, and six Democratic incumbents and one independent, who generally votes with them, announced plans to retire. Those departures gave Republicans seven open-seat targets to pick from.
Democratic retirements in solidly red Nebraska (Ben Nelson) and North Dakota (Kent Conrad) seemed like sure GOP pickups, while vulnerable incumbents in Missouri and Montana, both of which Obama lost in 2008, seemed to be laying the groundwork for a GOP majority.
Originally, strategists and analysts predicted that this scenario would decide the majority: GOP gains in Missouri, Nebraska and North Dakota would push Republicans to 50 seats, and a victory in either Montana or Virginia would seal the elevation of Minority Leader Mitch McConnell (Ky.) to majority leader.
Republicans still appear to be in fairly good shape in Nebraska, even though Democrats recruited former senator Bob Kerrey to run. In Missouri, Sen. Claire McCaskill, who won with 50 percent of the vote in 2006, remains in a difficult spot, as polls show her in the low 40s, but Democrats say that the lackluster field of challengers in the August primary gives her a potential opening for victory. In North Dakota, Democrats have recruited former attorney general Heidi Heitkamp to face the winner of a June 12 GOP primary between Rep. Rick Berg and 2000 Senate nominee Duane Sand.