It's hard enough convincing Iowans to venture from their homes on a weekday evening in mid-winter to spend a few hours caucusing in a school gymnasium, community center or church basement. But what happens if there's a blizzard or an ice storm? What if temperatures dip below zero? Conventional wisdom and past history suggest that bad weather benefits those candidates whose supporters are the most die-hard caucus-goers - and hurts those who are counting on an influx of first-time participants. Among the GOP contenders, bad weather might harm Huckabee's chances the most, since he is counting on sheer enthusiasm to make up for his campaign's lack of money and organization. In the Democratic contest, it means John Edwards is praying for snow, while Obama and Clinton hope for clear skies. The weather is particularly key to Clinton, since more than 1,000 of her pledged supporters are between the ages of 90 and, yes, 110. Her campaign has purchased hundreds of snow shovels and countless pounds of rock salt; campaign workers plan to literally dig out Hillary supporters, if necessary, to get them to their caucuses. They've also rented scores of SUVs to help ferry elderly voters to their caucus sites. Tonight's forecast: no precipitation but frigid temperatures across the state.