Professor Larry J. Sabato is well known for his political predictions and if this recent article in Politico is accurate, Democrats should be concerned.

Republicans Really Could Win It All This Year

Another midterm election beckons, and over the next 10 months we’ll see headlines about a thousand supposedly critical developments—the “game changers” and the “tipping points.” But we all know there aren’t a thousand powerful drivers of the vote. I’d argue that three factors are paramount: the president, the economy and the election playing field. And, at least preliminarily, those three factors seem to be pointing toward Republican gains in both houses in the 2014 midterms.

Why?

1. The president. His job approval numbers are perhaps the best indicator of the public’s overall political orientation at any given time, a kind of summary statistic that takes everything at the national level into account. In a large majority of cases, the president’s party does poorly in midterms, especially the second midterm of a two-term administration. It’s a rare president who doesn’t make enough mistakes by his sixth year to generate a disproportionate turnout among his opponents—thus producing a political correction at the polls. Presidents Dwight Eisenhower in 1958, Lyndon Johnson in 1966, Richard Nixon/Gerald Ford in 1974, Ronald Reagan in 1986 and George W. Bush in 2006 all experienced significant corrections in their sixth-year elections.

Still, this doesn’t always happen. Presidents Franklin Roosevelt in 1934 and Bush in 2002 managed to gain a few House seats, but this was in their first midterm. The Democrats lost no Senate seats and actually picked up a few in the House in 1998, President Bill Clinton’s second midterm.

President Barack Obama might take some heart from the Clinton example, but only up to a point. Like Clinton in 1994, Obama was unpopular enough by 2010 that Democrats lost the House in a landslide. That and partisan redistricting—a tactic engaged in by both parties but currently tilted to the GOP—reduces Republican chances for a House seat sweep in 2014 because there simply aren’t many additional seats available for Republicans, barring a tidal wave of voter anger even larger than 2010.