CHARLOTTE, N.C.- The second day of the Democratic convention features one president -- Bill Clinton -- promoting another -- Barack Obama.

Here are five things to watch from the Time Warner Cable Arena for Wednesday, Sept. 5:

1) Bubba is back: Observers will be looking to see how much Bill Clinton talks about Obama, and how much he talks about his own record from the 1990s. Also in the back of every Democrat's mind: Will Hillary Rodham Clinton run for president in 2016? The former president speaks last, probably starting after 10:30 p.m.

2) Elizabeth Warren is ready for her close-up: Warren, a Harvard law professor and long-time consumer advocate, is the Democratic nominee in Massachusetts. It's one of the nation's hottest Senate races, and could determine which party controls the chamber. She is challenging Republican incumbent Scott Brown, who won the seat after the death of Edward Kennedy.

3) Locking down the women's vote: Warren is one a series of women speakers at the convention, as Obama seeks to exploit his advantage over Republican challenger Mitt Romney among female voters, using such issues as contraceptives and abortion rights. Among the speakers tonight: Sandra Fluke, who was called a "slut" and "prostitute" by radio talk show host Rush Limbaugh after she testified on behalf of contraception services in health care plans.

4) The "great state" roll call: Officially, the convention is about nominating Obama and Vice President Biden to a second term and to do that, the roll call is required. Obama had no major party opposition in the primary season, so guess who's the favorite? But it's unclear how many TV viewers will see it: The roll call is supposed to begin after Clinton speaks.

5) The arrival: President Obama arrives in Charlotte this afternoon. Will he make a "surprise" appearance at the convention? Perhaps on stage with Bill Clinton? We don't know. We do know Obama will address the convention on Thursday night.

See photos of: Barack Obama, Hillary Rodham Clinton, Mitt Romney, Bill Clinton, Edward Kennedy, Rush Limbaugh, Scott Brown, Elizabeth Warren, Sandra Fluke

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