6. Can anyone else outshine the big 4? In a race packed with this much uncertainty, it's a mistake to dismiss anyone on stage. That includes Minnesota Sen. Amy Klobuchar and billionaire activist Tom Steyer, who may have struggled for attention for much of the last year but have each shown upside in recent weeks. Klobuchar, who had a strong showing in last month's debate, has a biography made for Iowa. And Steyer, who is flooding early voting states with a massive advertising campaign, raised eyebrows last week with surprisingly strong polling. They have yet to crack the top tier, but with the eyes of the political world on them Tuesday, the opportunity is there.