Want a sign of how much big, costlier and more ambitious the Democratic caucus efforts is this year compared to four years ago? Consider these two facts:
--Four years ago, eventual winner John Kerry entered caucus night with 300 drivers prepared to haul supporters to caucus sites. This year, says former Iowa Gov. Tom Vilsack, Hillary Clinton's campaign has 5,000 of them.
--Four years ago, Kerry entered caucus night with about 40,000 people identified as certain or likely to support Kerry. This year, an Obama campaign adviser says, the Illinois senator has about 80,000.
There's never been anything approaching this scale.
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