Challenges to stem cell research Stem cell research proponents have convinced some states to fund research, but the controversy continues over whether using embryonic stem cells crosses an ethical line. Experts on both sides debate where stem cell research is headed.9:06 a.m.
Meri Firpo: Assistant professor in medicine/endocrinology, embryonic stem cell researcher at the University of Minnesota.
Nigel Cameron: President of the Institute on Biotechnology and the Human Future at the Chicago-Kent School of Law.
Year of presidential firsts Chances are 2008 will be known as the year of a presidential first, perhaps for both Republicans and Democrats. Recent polls about personal identity are examining whether age, race, and other factors will influence voters' opinions of presidential candidates.10:06 a.m.
Frank Newport: Editor in chief of the Gallup Poll.
Mark Blumenthal: Political pollster, also known as "the Mystery Pollster." He writes political analysis for his blog.