Billionaires tax faces constitutional, political hurdles
By Jonathan Allen
Democrats Rush to Rewrite U.S. Tax Code in Days
By Alan Rappeport & Jim Tankersley
Democrats' Proposed Tax on Unrealized Capital Gains Likely Unconstitutional
By Giancarlo Canaparo
Democrats' billionaire tax would heavily target 10 wealthiest Americans, but alternative plan is emerging
By Andrew Van Dam, Tony Romm & Jeff Stein