The roll call began at the Democratic Convention in 2008...

[k8conant]

then:

Obama's formal nomination as the Democrat's standard-bearer came in a choreographed minuet that followed weeks of negotiations between the Clinton and Obama camps.

The balloting stood at 1,549 for Obama and 341 for Clinton -- with 2,210 delegates needed to clinch the nomination -- when it came Illinois' turn in the roll call of states. Chicago Mayor Richard M. Daley passed on behalf of the state delegation and the count skipped to New York. Clinton, surrounded by the governor and other state political leaders, read carefully from printed remarks, urging delegates to "declare together in one voice, right now, that Barack Obama is our candidate and he will be our president."

http://articles.latimes.com/2008/aug/28/nation/na-ledeall28

[StevieM]

1. Even before the roll call Hillary had already released her delegates. In fact, Arkansas voted

unanimously for Obama at Hillary's request.

[morningfog]

2. I honestly cannot predict how it will playing this year.

Will Bernie concede and endorse before the convention?

Or will he play it out, roll call state by state until Hillary clinches about half way through?

Will we know her VP pick before the convention?

Will she make it to the convention?

So much open as of now.