Nor are they your areas of expertise. Levin graduated law school and practices law even with his busy schedule. How about you? It would be a start.
I used to have great respect for Levin, then I woke up and realized what his true political agenda is, ... now go listen how he uses propaganda on his listeners to thwart US citizenship laws, and be sure to go read for yourself Edward Erler’s article @ Heritage on citizenship, and take note of the sections of that article that Levin purposely leaves out, evidence that destroys Levin's credibility as an unbiased interpreter of Constitutional law & A2 presidential qualifications.
http://www.heritage.org/research/reports/2005/12/birthright-citizenship-and-the-constitution
More proof from the Heritage Foundation that Levin either doesn't know what he is talking about, or he is purposely obfuscating the issue for political purposes