Marcia Gelbart reports:
6:10 p.m.

There's lots of traffic but not a lot of campaign signage on the way to Obama's party headquarters for tonight at the Water Works restaurant.

TV newscasters were doing there thing as the giant stage behind them is still being built.

For now, all is quiet - but restaurant owner Michael Karloutsos is ready for all that to change.

He got the call at 7 a.m. Monday that Obama staff were looking for a space for 600 for an "informal party." Well, that party is expected to grow to 1,500 here tonight.

Interesting side note: Karloutsos is the only Philadelphia resident who was a Bush Pioneer in 2004, meaning he raised $200,000 for the President. But last summer, he caught the Obama Bug. Seated on the restaurant veranda, with the sun reflecting off the river behind him and Boathouse Row in the distance, he said: "This time around, I was really attracted to the Obama message, and I wanted to be on the right side of history." His first order of business: switching his registration from R to D.