There is a presidential primary in New York and four other states today, but New Yorkers can be excused for not noticing as interest has collapsed in the state contests, with Mitt Romney now all but guaranteed to win the Republican Party nomination. Josh Robin reports.

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NEW YORK -- Manhattan Republican Chairman Daniel Isaacs said, "Even though, as you said, the race is effectively over at this point, I still think you'll see people get out and vote."

Effectively over, because Mitt Romney is all but assured to win not just in New York, but his party's nomination.

Rick Santorum never had overwhelming support in the Empire State. Then he dropped out. Ron Paul and Newt Gingrich are running, but Gingrich's backers just about disbanded when the former House Speaker won just a single state on Super Tuesday .

"Newt's a really good friend, I really admire Newt," said former Mayor Rudy Giuliani.

Options limited, Giuliani is endorsing Romney, a man he disparaged as a flip-flopper a few months back.

"I've never seen a guy change his positions, on so many things, so fast, on a dime. Everything," said Giuliani on MSNBC on Dec. 15.

This week, reporter Josh Robin asked Giuliani, "Mayor, what do you say to those who don't believe that he has too much of a core, that he's this political animal who goes to whatever position is going to make him succeed?"

Giuliani responded, "Well, I think the reality is that all of us in politics grow, change - change our positions. Look at President Obama. President Obama was against mandates. And then his biggest accomplishment, or I think his biggest mistake, was a mandate."

Giuliani said he and Romney will campaign together. Monday, Romney was in Pennsylvania with a possible running mate - Florida Senator Marco Rubio.

"We're campaigning today to encourage people to get out and vote," Romney said.

With no signs of candidates' signs upstate or down, that message isn't exactly trickling down.

"No, I did not know that."

"No."

"I'm not sure."

"I've been watching the new seeing that with the 2012 elections, but I did not know that it was the primary."

"Yes, I do, but that's because I keep up with political news."

The primaries will cost New York taxpayers between $20 million and $25 million, state officials say.