(CNN) The 2020 field is -- almost -- set. With former Texas Rep. Beto O'Rourke getting into the contest last week, the only big shoe left to drop is that of former Vice President Joe Biden who -- if we're being honest -- is as close to running as you can be without saying the words "I am running for president." Or is there one MORE major candidate out there that we've been missing....??!?!?

Here's a look at the 5 big story lines to watch in the 2020 campaign this week.

1. What does Week 2 of Beto look like?

There's no candidate about whom there is more interest -- and hot takes -- than O'Rourke. The first few days of his candidacy were VERY uneven -- he drew tons of media attention and crowds but also made some dumb statements (about his marriage and family, about how he was "born" to run for president) that suggest both a lack of discipline and a maybe-not-totally-ready-for-primetime-ness. (His supporters will, of course, write off these early hiccups to his authenticity; his opponents will be less charitable.)

O'Rourke will be very busy this week -- with stops in Wisconsin (Sunday), Michigan (Monday), Ohio (Monday), Pennsylvania (Tuesday), New Hampshire and, this coming weekend, South Carolina.