>> less risky, absolutely. >> it's a great case study in how voters are more complicated than we give them credit for. we tend to try to group these candidates in ideological can the gor-- categories. mrs. armstrong said he loves elizabeth warren and likes joe biden too. you wouldn't think you would narrow your choice down to those two options. >> one of the things president obama was ail to do was energize the left, the progressives, as a new face on the stage as well as be comforting enough to the moderates and people who did not want to move too far left. i think that's one of the reasons joe biden is getting support because people connect him to his time with obama. he's a comfortable candidate for a lot of people and can still say i have a record that has progressive policies as well. >> but then they watch him and they are like is he up to it? >> all were comfortable with biden but those three african-american women have been most impressed with elizabeth warren. can biden hold it or is she