Yes, there are no primaries or caucuses between now and April 22, when Pennsylvania voters go to the polls.

With 158 delegates at stake that day, Pennsylvania is by far the biggest state left on the Democratic side.

By my count, there are only eight states and two US territories left - Pennsylvania on April 22, Guam on May 3, Indiana and North Carolina vote May 6, West Virginia is on May 13, Kentucky and Oregon on May 20, Puerto Rico on June 1 and the finally Montana and South Dakota on June 3.

So I can see Obama and Clinton campaigning not only in Pennsylvania in coming weeks, but also making quick side trips to West Virginia, Indiana, North Carolina and even Kentucky.

But the focus will be Pennsylvania.

"We're very happy about it," Sen. Robert Casey (D-PA) told me yesterday just off the Senate floor.

"Both candidates will have a chance to enunciate their policy positions with a vigorous debate in a big, complicated, diverse state," Casey said.

As a U.S. Senator, Casey is one of the almost 800 superdelegates - and as of now, he's still uncommitted.

"I'm staying neutral and I will through our primary," the Senator told me.

No matter who wins, Casey sees one big plus from all this attention, and that's an economic shot in the arm from all the visiting candidates, staffers and journalists.

"We just want a lot of money spent in Pennsylvania," Casey said, "That's a good thing."