By Tom Foreman,
updated 5:30 PM EST, Fri January 18, 2013
Editor's note: CNN reporter and anchor Tom Foreman has been writing a letter each day, every day, to President Barack Obama since he was inaugurated four years ago. This is his last one.
-- When President Obama raises his hand, I will put down my pen. Or rather, I will step away from my computer keyboard.
Inauguration Day will signal the culmination of an effort I launched on January 20, 2009, to write a letter to the White House every single day of Barack Obama's first term.