Get Out The Vote campaigns are disingenuous at best, and voter fraud at worst. In fact, countries should take pride in having a low voter turn out, because that means they have a more concentrated percentage of concerned citizens, that are doing the voting. Think of the quality difference of Slashdot stories on the firehose (all 100%) when compared to the choosen few on the frontpage (1%).
"Don't even get me started on the frickin' Firehose." - Captain Splendid
Coercion vs Choice
Countries with near 100% voter turn-out often have widespread ballot-stuffing (hollow appearance of choice), or use threats of violence (coerced choice) to maintain their hold on power, but in a free country you have free choice, and that includes choosing not to vote.
"If you choose not to decide, you still have made a choice." - Rush
Funny Exception To The Rule
Australia is an exception with their mandatory turn-out laws (not mandatory vote), which can be explained by the fact that they are down-under. It also explains why, when it's winter here, that it's summer down-under, and why their toilets drain water clockwise instead of counter-clockwise. (Corilis Effect) Not to mention they look kind of tough, so it's probably not wise telling them what to do.
"Where does an Aussie croc crash? Anywhere he wants to." - Mate