* This afternoon, a presidential news conference on CNN, FNC and MSNBC.

* Tonight, Alan Alda guest-stars on "ER" on WRC.

* Game 2 of the American League Championship Series on WTTG.

* "Around Town" returns for its 15th season on WETA.

* And "Leo Tolstoy's Anna Karenina" on TNT.

Presidential News Conference

President Clinton holds his first news conference since July 21 (CNN, FNC and MSNBC, 1:30 p.m.).

Sports

Major League Baseball (CC). American League Championship Series, Game 2: Boston Red Sox at New York Yankees (Channel 5 at 8).

College Football. Toledo at Marshall (ESPN at 8).

Public Broadcasting

Around Town. The weekly arts review show returns for its 15th season; tonight, an interview with Shakespeare Theatre Artistic Director Michael Kahn and a review of Olney Theatre Center's "Death of a Salesman" (Channel 26, 8:30).

Mystery! An Unsuitable Job for a Woman (CC). Helen Baxendale reprises her role as private eye Cordelia Gray; in tonight's episode, a pregnant Gray accepts what she thinks will be a simple surveillance case (Channel 26 at 9).

Prime-Time Movie

Leo Tolstoy's Anna Karenina (1997). Sophie Marceau and Sean Bean star in the classic saga about a Russian woman trapped in a loveless marriage. Two hours (TNT, 10:15 p.m.).

Newsmagazines

20/20 Downtown (CC) reports on modern-day eunuchs and recounts the circumstances of the death 40 years ago of George Reeves, television's "Superman" (Channel 7 at 10).

48 Hours (CC) reports on the murder of Anne Marie Fahey by her lover, Delaware attorney Thomas Capano (Channel 9 at 10).

Series

Diagnosis Murder (CC). Sloan leads a campaign to clear the medical school head (Joanna Cassidy) on charges of narcotics trafficking (Channel 9 at 8).

Popular (CC). The rumor mill churns when Sam and Josh are caught in a compromising position (Channel 50 at 8).

Jesse (CC). Jesse's simple barbecue turns into a huge event (Channel 4, 8:30).

Wasteland (CC). Dawnie is furious with Ty, Jesse claims to be Jewish, and Sam's Southern accent is ridiculed (Channel 7 at 9).

Stark Raving Mad (CC). Henry blames himself for the death of a beloved children's author (Channel 4, 9:30).

ER (CC). Alan Alda portrays a legendary doctor who joins the staff and winds up clashing with Dr. Greene (Channel 4 at 10).

CAPTION: Alan Alda guest-stars as a physician tonight on "ER."