The scales tip toward Republicans: Welcome to the campaign. Post-Labor Day, the table is set for what is on pace to be the most expensive midterm in history. It could lead to a Republican majority in both the House and Senate for the last two years of President Barack Obama’s time in office. So why do Republicans have the advantage starting out? First, with primary season all but wrapped up — Delaware, Massachusetts, New Hampshire and Rhode Island hold the last primaries next Tuesday — Republicans have done all they can structurally to prevent problematic candidates from emerging, unlike in years past. But most importantly, it’s where these races are taking place — largely in conservative-leaning states. In fact, of the 12 states with competitive Senate races that are likely to decide the outcome of control of the Senate, Republican Mitt Romney won nine of them in the 2012 presidential election by an average of 16 points. And that’s in a year when Republicans lost the Electoral College by 126 votes. (Republicans need to net six states seats to wrest control.) What’s more, if you add in the three states won by President Obama, Republicans still have an 11-point advantage. Democrats are defending more states — 10 of the 12 are seats held by Democrats. And the two Democratic targets are in states Romney won by an average of 15 points. Plus, the demographics of who shows up in midterm elections favor Republicans. The electorate in midterms is generally whiter, older, more likely to be married and have better paying jobs.

The above was copied in its entirety from the PBS website and can be read HERE