(CNN) With 288 days until the Iowa caucuses and a record number of Democratic candidates, the 2020 election is already in full swing. Every Sunday, I'll tell you the 5 BIG storylines you need to know to understand the upcoming week on the campaign trail. And they're ranked -- so the #1 story is the most important of the coming week. Subscribe to The Point newsletter to get this delivered directly to your inbox!

5. 20 for 2020: By the time we hit the end of the week By the time we hit the end of the week we should have 20 announced Democratic presidential candidates in the race. While Joe Biden's entrance will draw the most attention -- scroll down for much more on the former VP's candidacy -- Massachusetts Rep. Seth Moulton is also expected to officially join the race this week.

The 2020 Democratic field is already the largest in modern political history -- passing the 17 people who ran for the Republican nod in 2016.

The challenges of a big field are myriad: It's hard to know where to put your resources -- or who is aiming at you. (I've compared it to a horse running in the always-crowded Kentucky Derby.)

Opportunity exists, too -- particularly for lesser-known candidates. Get to double-digit support in Iowa or New Hampshire and, suddenly, you could find yourself in third place!