When you think about this issue logically, it is completely - irrelevant. Ted Cruz is a United States senator. He was the most prominent conservative this year. He was the main opponent of funding President Obama's health care takeover. Cruz has been everything liberal news media dreads in an elected official - a conservative with backbone and a microphone.
Cruz' Canadian citizenship, which is literally nothing except a technicality, has no bearing on any of the issues he has discussed. It also has no bearing on his American citizenship or his ability to serve as President of the United States. He has said he wants to renounce it, and is working to do so. Why is it all the sudden a key issue? It is often difficult to point out media bias. In this situation, it is rather easy. One type of news media bias is to minimize an important story, or to overplay an irrelevant or unimportant story. Cruz' paperwork citizenship in Canada is unimportant and irrelevant, yet we see it in the news and on the web constantly. My diagnosis is a severe case of left-leaning cognitive dissonance, a desire to talk about anything except the truth, conservative values, and common-sense Cruz has brought to the political table.