During last night's Democratic presidential debate, candidates exchanged blows, with Sen. Elizabeth Warren leading attacks on billionaire Michael Bloomberg for funding his campaign using his considerable wealth without releasing his tax returns. Bloomberg responded at one point by mentioning that Sen. Bernie Sanders, a self-described Democratic socialist, has three homes.

The debate's moderators pointed out that Bloomberg had previously donated large amounts of money to Democratic causes. They asked why, then, his money is a problem at this point in the race.