McSweeney's has a fantastic compilation of childrens' letters to Obama. Some of them are so adorably fantastic. It seems to be kids between 5 and 12 mostly. Even if you don't like Obama, you still can appreciate the innocence of their words.
Dear President Obama,
When you are president, don't eat junk food. Junk food makes you fat. Your family shouldn't eat junk food, either, because it is not healthy. Obama, you rock.
Amy Ramirez, age 8
San Francisco
Dear President Obama, Are you going to be pictured on our money? How do you get in the White House? Do you like Abraham Lincoln? Do you have a big backyard? Martin Luther King Jr. had big fans. How many fans do you have? You could help us by giving us food. I am Luis Ramirez. I go to school at Mayberry. I like to play video games.
Luis Ramirez, age 8
Los Angeles
http://www.mcsweeneys.net/books/thanksandhavefunrunningthecountry/