CNN:

In the canon of political cliches, "it all comes down to turnout" is among the most tired.

But in the case of the polarizing and closely watched Wisconsin recall election, the maxim happens to ring true.

Public polling, internal polling and campaign strategists all tell the same story: Republican Gov. Scott Walker is clinging to a tiny lead over his Democratic opponent, Milwaukee Mayor Tom Barrett, heading into Tuesday's vote.

And the number of undecided voters has dwindled to almost zero, strategists in both parties say, meaning that the only mission left for both sides is to get their rabid supporters to the polls.

If just the one million people who signed the Walker recall petition get themselves to the polls today, Wisconsin will be free of Scott Walker once and for all.