Joe Biden has a political imperative as he embarks on his 2020 presidential bid — to be more like Ronald Reagan circa 1980 and less like Jeb Bush in 2016.

Biden this week became the 20th major Democratic candidate to announce he’s contesting the right to challenge President Trump to the White House next year, a clear favorite in early polls thanks to the national profile he’s built over three decades in the Senate and eight years as President Barack Obama’s No. 2.