UPDATED VERSION HERE
Can the GOP repeat (or better) its showing in the 2010 mid-term election? In that election, the GOP candidates for the House of Representatives garnered 53.4 percent of the two-party popular vote. As a result, the GOP gained 64 House seats and returned to the majority. Over in the Senate, the GOP gained 6 seats, a good rebound but not enough for a majority.
It’s certain that the mid-term of 2014 will yield a GOP majority in the House. The present 33-seat majority might even become the 49-seat majority that resulted from the 2010 mid-term — or something larger.
The outlook for the Senate is less clear, though there’s good reason to expect a GOP gain of at least 6 seats (as in 2010). It will take a gain of 6 seats (or more) 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 based on 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 slightly worse in 2014 than it did in 2010 — another good sign for the GOP.
Some words of caution: In the absence of bad news for Obama (e.g., more beheadings, a military fiasco in the Middle East, a new scandal, a spate of huge increases in health-insurance premiums), his unpopularity may continue to diminish, as it has in recent weeks. If that happens, he won’t be a severe drag on Democrat candidates for the House and Senate. Which means that it will take a lot of hard and effective campaigning if the GOP is to increase its House majority and regain control of the Senate.
It ain’t over ’til it’s over.

