Two dollar bills are simply tracers. In the late '80s and early '90s, they were given out as a means of tracking the actual physical circulation of currency. They were most commonly paid out by recycling centers .
There isn't any real demand for two dollar bills. They're just there, as long as you can spend them. As for getting rid of the penny ( ^above^). The unit of American currency has always been the penny Not the Dollar.

So... since the American two-dollar bill is -in fact- real, current circulation, legal tender, you're saying Obama's birth certificate is real too...

https://en.wikipedia.org/wiki/United_States_two-dollar_bill

Ah...in that case - I'm guessing it's the fact that his $2 bills are not a full copy of a real $2 bill...they look like a $2 bill, but there's nothing illegal with making something that looks like a $2 bill - as long as you're not copying a real bill.

>> ^AdrianBlack:

Two dollar bills are still in circulation and are still considered legal tender. Odd but true.

Two dollar bills are still in circulation and are still considered legal tender. Odd but true.
>> ^Tokoki:

Someone else can probably confirm - but since there are no legal $2 bills...it is not illegal to print your own $2 bill.