(The Washington Post) The Iowa Democratic Partys fall fundraising dinner has often been the tone-setter for the stretch run ahead of the states first-in-the-nation presidential caucuses. If the speeches and demonstrations here Friday night were any indication Sen. Elizabeth Warren (D-Mass.) and South Bend Ind. Mayor Pete Buttigieg now see themselves on a collision course. Other candidates continue to be factors: Former vice president Joe Biden and Sen. Bernie Sanders (I-Vt.) are the most obvious. People also talk about the possibility that someone well down in the polls could suddenly emerge. Right now however the focus increasingly is on Warren and Buttigieg. Warren is widely regarded as the candidate to beat in Iowa. Her organization is judged as the best in the field and her disciplined campaign style has helped to provide the edge she enjoys.