>> baseball great roger clem mens is back in court to face purgery charges stemming from purgery chargestrial after prosecutors made a mistake in proceedings. he denied using performance enhancing drugs like human growth hormone. at the same hearing it was testified to injecting clem mens with steroids. the cy young winner could face up to 21 months in prison. the trial is expected to last four to six weeks. >> now to the other big stories in the week ahead.week. >> i'm athina jones. the president travels to columbia for a meeting on the economy. he also will hook up with tony stewart and will head up the bike ride to the white house. >> wall street kicks off this week with a bang. tons of corporate earnings coming up. we'll get the numbers from citigroup, coca-cola, mcdonald's, just to name a few, and the retail sales report is out and investors will be watching that report very closely. we'll track it all for you on cnn money. >> i'm "showbiz tonight's" nischelle turner. here's what we're watching this week. vinny from the jersey shore talks about his new book. every night eastern and