Obama to announce strategy to "destroy" ISIS: How did they get here so quickly?

It's time to go after ISIS in Iraq and Syria, President Barack Obama will tell the country Wednesday night in a nationally televised address intended to sell stepped-up military efforts to a war-weary public.

The president will need to convince the American people that ISIS is a major threat to the United States and military action is necessary.

So how did this group - a group that the president called a "JV team" only months ago become so powerful?

Deborah Feyerick has our report.