New York Gov. Andrew Cuomo makes a point during a meeting on tax cut proposals in the Red Room at the Capitol on Monday, Jan. 6, 2014, in Albany, N.Y. Cuomo has proposed cutting the state’s corporate income tax from 7.1 percent to 6.5 percent and eliminating it altogether for upstate manufacturers. He also has proposed paying more state aid as an incentive to any of New York’s 10,500 local governments that impose hard 2 percent spending caps and cut their costs by consolidating services with other towns, villages, cities and counties. (AP Photo/Mike Groll) New York Gov. Andrew Cuomo on Jan. 6 in Albany, N.Y. (Mike Groll/Associated Press)

Every now and then, it’s fun to watch a cage match between Democrats instead of Republicans. In one corner stands Andrew Cuomo, governor of New York and potential candidate for president; in the other, Bill de Blasio, the new mayor of New York. In the governor’s budget unveiled this week, he promised to fully fund universal pre-kindergarten in New York, trumping Bill de Blasio’s central campaign promise to do the same for New York City. The difference is that Cuomo, while not specifying the funding mechanism, says his budget will lower taxes and pay for pre-K; de Blasio’s plan emphatically called for raising taxes on the rich to cover the expansion.

If you’re wondering why the two couldn’t just get together and announce a joint proposal, the answer is that both men seem to have political reason to emphasize their differences. Cuomo wants to be tout a record as a governor who is fiscally responsible but progressive, while the mayor seems to want to make good on his campaign promise to make the wealthy pay. De Blasio appeared flat-footed in his reaction to Cuomo’s proposal, saying it wasn’t good enough because it doesn’t lock in the funding.

At another level, the Cuomo-de Blasio rift could signal a deeper rift in the Democratic Party between its centrist and liberal wings, between those who view the party’s success as based on appealing to moderates and those who think the issue of income equality has fundamentally shifted the debate to the left. Yet, it would seem, in this instance, the governor has outwitted the mayor. He is offering to implement the mayor’s promise. Is a tax increase more important than universal pre-k to the mayor? I would think that would be shaky ground on which to fight, even for the nation’s newest liberal icon.