Sen. Joe Manchin (D-W. Va.) on Tuesday decried President Joe Biden’s recently-unveiled proposal to increase taxation on billionaires, saying that the plan would tax assets that billionaires don’t have. Biden’s proposal, called the Billionaire Minimum Income Tax, would place a minimum tax rate of 20 percent on America’s wealthiest households. The plan would go a step farther than many other plans, however, and would also impose taxes on unrealized gains from stocks, bonds, and similar assets. In short, the plan would tax the total net worth of billionaires even while their assets remain tied up in assets rather than in liquid cash. The plan, Manchin said, would put taxes on”things you don’t have.” “You might have it on paper,” Manchin added. “There are other ways for people to pay their fair share, and I think everyone should pay.” In the past, Manchin has staked out a middle position toward tax …