President Obama's effort to deny that his mandate to buy insurance is a tax has taken another thumping, this time from fellow Democrats in the Senate Finance Committee.

Chairman Max Baucus's bill includes the so-called individual mandate, along with what he calls a $1,900 "excise tax" if you don't buy health insurance. (It had been as much as $3,800 but Democrats reduced the amount last week to minimize the political sticker shock.) And, lo, it turns out that if you don't pay that tax, the IRS could punish you with a $25,000...