On the eve of Election Day, there's a shake-up in New York politics as Democrats hope to take back control of the state Senate. Zack Fink filed the following report.

Jesse Hamilton is leaving the mainstream state Senate Democrats and joining the breakaway Independent Democratic Conference, becoming the seventh member of the group known as the IDC.

The move would leave the mainline Senate Democrats with 24 members.

Currently, the IDC has joined Senate Republicans to form a power-sharing arrangement.

"I'm a Democrat, and IDC are Democrats. We are all Democrats," Hamilton said. "Jeff Klein and I, we're great friends. I've known him for a prolonged period of time. And it's the policies of the Independent Democratic Conference, such as increasing the minimum wage to $15 an hour."

The development, and this tricky political math, comes just a day before an election in which Democrats remain hopeful they can pick up enough seats in the city's suburbs to form a majority. But it seems likely that no matter what happens tomorrow, especially now, the IDC will play the key role in determining which party controls the majority by deciding whether to form a coalition with Democrats or continue with Republicans.

As of now, IDC leader Jeff Klein of the Bronx is waiting to see what happens after the election.

"They constantly say somehow, we empower the Republicans. No, I think it can be said that they empowered us. That's how we were able to get so many of these things done," Klein said. "And we want to keep the momentum going. We started off six years ago with four members. Now today, we have seven."

Governor Andrew Cuomo has been campaigning hard for Senate Democrats, and this is the first year he has actually helped them raise money. Cuomo has said he wants a Democratic majority to achieve meaningful ethics reform in Albany, but they will need to broker a deal with the IDC to do that.

"Ultimately, you're correct. The question will be, what does the independent Democratic coalition do? And that is going to be up to them," Cuomo said Friday. "They will probably be the swing vote no matter what happens."

Some Democrats now acknowledge that they may not pick up as many seats on Long Island as previously thought. That could potentially give the IDC even more bargaining power as talks begin in earnest after the election about forming the majority.