LATEST VERSION HERE
Can the GOP repeat or improve on its showing in the 2010 mid-term election? Four years ago, the GOP won 242 House seats, a gain of 64 and more than enough to retake the majority. Over in the Senate, the GOP gained 6 seats, a good rebound but not enough for a majority.
Despite the loss of 8 House seats in 2012, the GOP retained a comfortable majority. And it’s almost certain that the GOP will hold a larger majority when all the votes are counted in November.
The outlook for the Senate is less clear, though there’s good reason to expect a GOP gain of 6 seats (or more) — enough to restore GOP control of the Senate.
I base my optimism on some indicators that I’ll continue to update as election day approaches. They’re drawn from the Obama Approval Index History published at Rasmussen Reports, and Rasmussen’s sporadic polling of likely voters about Obamacare (latest report here).

The first indicator (blue lines) measures Obama’s overall rating with likely voters. This indicator is a measure of superficial support for Obama. On that score, he’s doing about as well as he was four years ago at this time.
The second indicator (black lines) measures Obama’s rating with likely voters who express strong approval or disapproval. Obama’s strong-approval rating is below the pace of four years ago, which is a good sign for the GOP.
The third indicator (red lines) represents Obama’s strong-approval quotient (fraction of likely voters who strongly approve/fraction of likely voters who approve) divided by his strong-disapproval quotient (fraction of likely voters who strongly disapprove/fraction of likely voters who disapprove). I call this the “enthusiasm” indicator. Higher values represent greater enthusiasm for Obama; lower values, less enthusiasm. This is perhaps the best measure of support for Obama — and it looks a lot worse (for Democrats) than it did in 2010.
The green points (connected by lines) are plots of Obamacare’s standing, as measured by the ratio of strong approval to strong disapproval among likely voters. Obamacare is faring much worse in 2014 than it did in 2010 — another good sign for the GOP.
Some words of caution: It ain’t over ’til it’s over.

