California's Billionaire Tax Proposal Has 'Slippery Slope' Lever

California's Billionaire Tax Proposal Has 'Slippery Slope' Lever California’s latest effort to tax its richest residents into leaving is barreling toward the ballot - only this time, it's got a built-in 'slippery slope' lever once voters hand them the keys. Backers of the proposed “billionaire tax” say they have already cleared the first hurdle, gathering more than enough signatures (at least 1.5 million) to qualify a measure that would impose a one-time 5% levy on residents with...