WASHINGTON (AP) — The Democrats’ debate lineup is down to a tidy trio, now that two other presidential candidates have quit the race. That should make it easier to keep the debaters straight: the woman, the socialist and … who’s that other guy? Oh yeah, former Maryland Gov. Martin O’Malley.

The new math gives O’Malley, barely registering in polls so far, better odds of getting noticed Saturday night in this second go-round for Democrats.

A guide to the personalities taking the stage in Des Moines, Iowa, for the CBS broadcast:

HILLARY RODHAM CLINTON

Key features: Nearly everybody recognizes her. She’s the only candidate who’s lived in the White House already, as first lady.

A quick sketch:

• daughter of a fabric store owner and a homemaker living in the Chicago suburbs.
• met her future husband and future president, Bill Clinton, at Yale Law School.
• after serving as first lady of Arkansas and then of the country, elected to Senate from New York.
• early Democratic front-runner in ’08, lost presidential nomination to Barack Obama.
• both praised and criticized in four years as Obama’s secretary of state.

Read the article “Debate Cast Guide: Live from Des Moines, It’s Saturday Night” on news.yahoo.com.