Go check the polls, as I said its a simple matter of a google search, the main thing people were saying at the time was the economy, I checked multiple sources. They may have been polled as part of the questionaire about their feelings on the health law, but as I stated public opinion has been underwater from the get go on that. In short you are mistaken if you believe that Ted Cruz swung the election. Now Cruz is a fine fellow and a phenomenal speaker who has borne more than his fair share of abuse, but at the moment the guy is pulling in 4% among Republicans.
Your research is so flawed - the idea that 83% of voters were late deciders? In a mid term? Surely even you know how absurd that is. The sources you had were either flawed, or you don’t know how to read polls.
You shouldn't try this at home. He may be at 4% among all Republicans, but among those who most closely follow the process, he's at 10X that much. As the campaign unfolds, more and more Republicans will be involved in the process. The most educated voters prefer him. As others get educated, they'll reach the same conclusion.